// Copyright IBM Corp. 2013,2016. All Rights Reserved.
// Node module: loopback-datasource-juggler
// This file is licensed under the MIT License.
// License text available at https://opensource.org/licenses/MIT

// This test written in mocha+should.js
var should = require('./init.js');
var jdb = require('../');
var DataSource = jdb.DataSource;
var createPromiseCallback = require('../lib/utils.js').createPromiseCallback;

var db, tmp, Book, Chapter, Author, Reader;
var Category, Job;
var Picture, PictureLink;
var Person, Address;
var Link;

var getTransientDataSource = function(settings) {
  return new DataSource('transient', settings, db.modelBuilder);
};

var getMemoryDataSource = function(settings) {
  return new DataSource('memory', settings, db.modelBuilder);
};

describe('relations', function() {
  before(function() {
    db = getSchema();
  });

  describe('hasMany', function() {
    before(function(done) {
      Book = db.define('Book', { name: String, type: String });
      Chapter = db.define('Chapter', { name: { type: String, index: true },
        bookType: String });
      Author = db.define('Author', { name: String });
      Reader = db.define('Reader', { name: String });

      db.automigrate(['Book', 'Chapter', 'Author', 'Reader'], done);
    });

    it('can be declared in different ways', function(done) {
      Book.hasMany(Chapter);
      Book.hasMany(Reader, { as: 'users' });
      Book.hasMany(Author, { foreignKey: 'projectId' });
      var b = new Book;
      b.chapters.should.be.an.instanceOf(Function);
      b.users.should.be.an.instanceOf(Function);
      b.authors.should.be.an.instanceOf(Function);
      Object.keys((new Chapter).toObject()).should.containEql('bookId');
      Object.keys((new Author).toObject()).should.containEql('projectId');

      db.automigrate(['Book', 'Chapter', 'Author', 'Reader'], done);
    });

    it('can be declared in short form', function(done) {
      Author.hasMany('readers');
      (new Author).readers.should.be.an.instanceOf(Function);
      Object.keys((new Reader).toObject()).should.containEql('authorId');

      db.autoupdate(['Author', 'Reader'], done);
    });

    describe('with scope', function() {
      before(function(done) {
        Book.hasMany(Chapter);
        done();
      });

      it('should build record on scope', function(done) {
        Book.create(function(err, book) {
          var c = book.chapters.build();
          c.bookId.should.eql(book.id);
          c.save(done);
        });
      });

      it('should create record on scope', function(done) {
        Book.create(function(err, book) {
          book.chapters.create(function(err, c) {
            should.not.exist(err);
            should.exist(c);
            c.bookId.should.eql(book.id);
            done();
          });
        });
      });

      it('should create record on scope with promises', function(done) {
        Book.create()
        .then (function(book) {
          return book.chapters.create()
          .then (function(c) {
            should.exist(c);
            c.bookId.should.eql(book.id);
            done();
          });
        }).catch(done);
      });

      it('should create a batch of records on scope', function(done) {
        var chapters = [
          { name: 'a' },
          { name: 'z' },
          { name: 'c' },
        ];
        Book.create(function(err, book) {
          book.chapters.create(chapters, function(err, chs) {
            should.not.exist(err);
            should.exist(chs);
            chs.should.have.lengthOf(chapters.length);
            chs.forEach(function(c) {
              c.bookId.should.eql(book.id);
            });
            done();
          });
        });
      });

      it('should create a batch of records on scope with promises', function(done) {
        var chapters = [
          { name: 'a' },
          { name: 'z' },
          { name: 'c' },
        ];
        Book.create(function(err, book) {
          book.chapters.create(chapters)
          .then(function(chs) {
            should.exist(chs);
            chs.should.have.lengthOf(chapters.length);
            chs.forEach(function(c) {
              c.bookId.should.eql(book.id);
            });
            done();
          }).catch(done);
        });
      });

      it('should fetch all scoped instances', function(done) {
        Book.create(function(err, book) {
          book.chapters.create({ name: 'a' }, function() {
            book.chapters.create({ name: 'z' }, function() {
              book.chapters.create({ name: 'c' }, function() {
                verify(book);
              });
            });
          });
        });
        function verify(book) {
          book.chapters(function(err, ch) {
            should.not.exist(err);
            should.exist(ch);
            ch.should.have.lengthOf(3);

            var chapters = book.chapters();
            chapters.should.eql(ch);

            book.chapters({ order: 'name DESC' }, function(e, c) {
              should.not.exist(e);
              should.exist(c);

              c.shift().name.should.equal('z');
              c.pop().name.should.equal('a');
              done();
            });
          });
        }
      });

      it('should fetch all scoped instances with promises', function(done) {
        Book.create()
        .then(function(book) {
          return book.chapters.create({ name: 'a' })
          .then(function() {
            return book.chapters.create({ name: 'z' });
          })
          .then(function() {
            return book.chapters.create({ name: 'c' });
          })
          .then(function() {
            return verify(book);
          });
        }).catch(done);

        function verify(book) {
          return book.chapters.getAsync()
          .then(function(ch) {
            should.exist(ch);
            ch.should.have.lengthOf(3);

            var chapters = book.chapters();
            chapters.should.eql(ch);

            return book.chapters.getAsync({ order: 'name DESC' })
            .then(function(c) {
              should.exist(c);

              c.shift().name.should.equal('z');
              c.pop().name.should.equal('a');
              done();
            });
          });
        }
      });

      it('should fetch all scoped instances with getAsync with callback and condition', function(done) {
        Book.create(function(err, book) {
          book.chapters.create({ name: 'a' }, function() {
            book.chapters.create({ name: 'z' }, function() {
              book.chapters.create({ name: 'c' }, function() {
                verify(book);
              });
            });
          });
        });
        function verify(book) {
          book.chapters(function(err, ch) {
            should.not.exist(err);
            should.exist(ch);
            ch.should.have.lengthOf(3);

            var chapters = book.chapters();
            chapters.should.eql(ch);

            book.chapters.getAsync({ order: 'name DESC' }, function(e, c) {
              should.not.exist(e);
              should.exist(c);

              c.shift().name.should.equal('z');
              c.pop().name.should.equal('a');
              done();
            });
          });
        }
      });

      it('should fetch all scoped instances with getAsync with callback and no condition', function(done) {
        Book.create(function(err, book) {
          book.chapters.create({ name: 'a' }, function() {
            book.chapters.create({ name: 'z' }, function() {
              book.chapters.create({ name: 'c' }, function() {
                verify(book);
              });
            });
          });
        });
        function verify(book) {
          book.chapters(function(err, ch) {
            should.not.exist(err);
            should.exist(ch);
            ch.should.have.lengthOf(3);

            var chapters = book.chapters();
            chapters.should.eql(ch);

            book.chapters.getAsync(function(e, c) {
              should.not.exist(e);
              should.exist(c);
              should.exist(c.length);
              c.shift().name.should.equal('a');
              c.pop().name.should.equal('c');
              done();
            });
          });
        }
      });

      it('should find scoped record', function(done) {
        var id;
        Book.create(function(err, book) {
          book.chapters.create({ name: 'a' }, function(err, ch) {
            id = ch.id;
            book.chapters.create({ name: 'z' }, function() {
              book.chapters.create({ name: 'c' }, function() {
                verify(book);
              });
            });
          });
        });

        function verify(book) {
          book.chapters.findById(id, function(err, ch) {
            should.not.exist(err);
            should.exist(ch);
            ch.id.should.eql(id);
            done();
          });
        }
      });

      it('should find scoped record with promises', function(done) {
        var id;
        Book.create()
        .then(function(book) {
          return book.chapters.create({ name: 'a' })
          .then(function(ch) {
            id = ch.id;
            return book.chapters.create({ name: 'z' });
          })
          .then(function() {
            return book.chapters.create({ name: 'c' });
          })
          .then(function() {
            return verify(book);
          });
        }).catch(done);

        function verify(book) {
          return book.chapters.findById(id)
          .then(function(ch) {
            should.exist(ch);
            ch.id.should.eql(id);
            done();
          });
        }
      });

      it('should count scoped records - all and filtered', function(done) {
        Book.create(function(err, book) {
          book.chapters.create({ name: 'a' }, function(err, ch) {
            book.chapters.create({ name: 'b' }, function() {
              book.chapters.create({ name: 'c' }, function() {
                verify(book);
              });
            });
          });
        });

        function verify(book) {
          book.chapters.count(function(err, count) {
            should.not.exist(err);
            count.should.equal(3);
            book.chapters.count({ name: 'b' }, function(err, count) {
              should.not.exist(err);
              count.should.equal(1);
              done();
            });
          });
        }
      });

      it('should count scoped records - all and filtered with promises', function(done) {
        Book.create()
        .then(function(book) {
          book.chapters.create({ name: 'a' })
          .then(function() {
            return book.chapters.create({ name: 'b' });
          })
          .then(function() {
            return book.chapters.create({ name: 'c' });
          })
          .then(function() {
            return verify(book);
          });
        }).catch(done);

        function verify(book) {
          return book.chapters.count()
          .then(function(count) {
            count.should.equal(3);
            return book.chapters.count({ name: 'b' });
          })
          .then(function(count) {
            count.should.equal(1);
            done();
          });
        }
      });

      it('should set targetClass on scope property', function() {
        should.equal(Book.prototype.chapters._targetClass, 'Chapter');
      });

      it('should update scoped record', function(done) {
        var id;
        Book.create(function(err, book) {
          book.chapters.create({ name: 'a' }, function(err, ch) {
            id = ch.id;
            book.chapters.updateById(id, { name: 'aa' }, function(err, ch) {
              verify(book);
            });
          });
        });

        function verify(book) {
          book.chapters.findById(id, function(err, ch) {
            should.not.exist(err);
            should.exist(ch);
            ch.id.should.eql(id);
            ch.name.should.equal('aa');
            done();
          });
        }
      });

      it('should update scoped record with promises', function(done) {
        var id;
        Book.create()
        .then(function(book) {
          return book.chapters.create({ name: 'a' })
          .then(function(ch) {
            id = ch.id;
            return book.chapters.updateById(id, { name: 'aa' });
          })
          .then(function(ch) {
            return verify(book);
          });
        })
        .catch(done);

        function verify(book) {
          return book.chapters.findById(id)
          .then(function(ch) {
            should.exist(ch);
            ch.id.should.eql(id);
            ch.name.should.equal('aa');
            done();
          });
        }
      });

      it('should destroy scoped record', function(done) {
        var id;
        Book.create(function(err, book) {
          book.chapters.create({ name: 'a' }, function(err, ch) {
            id = ch.id;
            book.chapters.destroy(id, function(err, ch) {
              verify(book);
            });
          });
        });

        function verify(book) {
          book.chapters.findById(id, function(err, ch) {
            should.exist(err);
            done();
          });
        }
      });

      it('should destroy scoped record with promises', function(done) {
        var id;
        Book.create()
        .then(function(book) {
          return book.chapters.create({ name: 'a' })
          .then(function(ch) {
            id = ch.id;
            return book.chapters.destroy(id);
          })
          .then(function(ch) {
            return verify(book);
          });
        })
        .catch(done);

        function verify(book) {
          return book.chapters.findById(id)
          .catch(function(err) {
            should.exist(err);
            done();
          });
        }
      });

      it('should check existence of a scoped record', function(done) {
        var id;
        Book.create(function(err, book) {
          book.chapters.create({ name: 'a' }, function(err, ch) {
            id = ch.id;
            book.chapters.create({ name: 'z' }, function() {
              book.chapters.create({ name: 'c' }, function() {
                verify(book);
              });
            });
          });
        });

        function verify(book) {
          book.chapters.exists(id, function(err, flag) {
            should.not.exist(err);
            flag.should.be.eql(true);
            done();
          });
        }
      });

      it('should check existence of a scoped record with promises', function(done) {
        var id;
        Book.create()
        .then(function(book) {
          return book.chapters.create({ name: 'a' })
          .then(function(ch) {
            id = ch.id;
            return book.chapters.create({ name: 'z' });
          })
          .then(function() {
            return book.chapters.create({ name: 'c' });
          })
          .then(function() {
            return verify(book);
          });
        }).catch(done);

        function verify(book) {
          return book.chapters.exists(id)
          .then(function(flag) {
            flag.should.be.eql(true);
            done();
          });
        }
      });

      it('should check ignore related data on creation - array', function(done) {
        Book.create({ chapters: [] }, function(err, book) {
          should.not.exist(err);
          book.chapters.should.be.a.function;
          var obj = book.toObject();
          should.not.exist(obj.chapters);
          done();
        });
      });

      it('should check ignore related data on creation with promises - array', function(done) {
        Book.create({ chapters: [] })
        .then(function(book) {
          book.chapters.should.be.a.function;
          var obj = book.toObject();
          should.not.exist(obj.chapters);
          done();
        }).catch(done);
      });

      it('should check ignore related data on creation - object', function(done) {
        Book.create({ chapters: {}}, function(err, book) {
          should.not.exist(err);
          book.chapters.should.be.a.function;
          var obj = book.toObject();
          should.not.exist(obj.chapters);
          done();
        });
      });

      it('should check ignore related data on creation with promises - object', function(done) {
        Book.create({ chapters: {}})
        .then(function(book) {
          book.chapters.should.be.a.function;
          var obj = book.toObject();
          should.not.exist(obj.chapters);
          done();
        }).catch(done);
      });
    });
  });

  describe('hasMany through', function() {
    var Physician, Patient, Appointment, Address;

    before(function(done) {
      // db = getSchema();
      Physician = db.define('Physician', { name: String });
      Patient = db.define('Patient', { name: String });
      Appointment = db.define('Appointment', { date: { type: Date,
        default: function() {
          return new Date();
        } }});
      Address = db.define('Address', { name: String });

      Physician.hasMany(Patient, { through: Appointment });
      Patient.hasMany(Physician, { through: Appointment });
      Patient.belongsTo(Address);
      Appointment.belongsTo(Patient);
      Appointment.belongsTo(Physician);

      db.automigrate(['Physician', 'Patient', 'Appointment', 'Address'], done);
    });

    it('should build record on scope', function(done) {
      Physician.create(function(err, physician) {
        var patient = physician.patients.build();
        patient.physicianId.should.eql(physician.id);
        patient.save(done);
      });
    });

    it('should create record on scope', function(done) {
      Physician.create(function(err, physician) {
        physician.patients.create(function(err, patient) {
          should.not.exist(err);
          should.exist(patient);
          Appointment.find({ where: { physicianId: physician.id, patientId: patient.id }},
            function(err, apps) {
              should.not.exist(err);
              apps.should.have.lengthOf(1);
              done();
            });
        });
      });
    });

    it('should create record on scope with promises', function(done) {
      Physician.create()
      .then(function(physician) {
        return physician.patients.create()
        .then(function(patient) {
          should.exist(patient);
          return Appointment.find({ where: { physicianId: physician.id, patientId: patient.id }})
          .then(function(apps) {
            apps.should.have.lengthOf(1);
            done();
          });
        });
      }).catch(done);
    });

    it('should create multiple records on scope', function(done) {
      var async = require('async');
      Physician.create(function(err, physician) {
        physician.patients.create([{}, {}], function(err, patients) {
          should.not.exist(err);
          should.exist(patients);
          patients.should.have.lengthOf(2);
          function verifyPatient(patient, next) {
            Appointment.find({ where: {
              physicianId: physician.id,
              patientId: patient.id,
            }},
              function(err, apps) {
                should.not.exist(err);
                apps.should.have.lengthOf(1);
                next();
              });
          }
          async.forEach(patients, verifyPatient, done);
        });
      });
    });

    it('should create multiple records on scope with promises', function(done) {
      var async = require('async');
      Physician.create()
      .then(function(physician) {
        return physician.patients.create([{}, {}])
        .then(function(patients) {
          should.exist(patients);
          patients.should.have.lengthOf(2);
          function verifyPatient(patient, next) {
            Appointment.find({ where: {
              physicianId: physician.id,
              patientId: patient.id,
            }})
            .then(function(apps) {
              apps.should.have.lengthOf(1);
              next();
            });
          }
          async.forEach(patients, verifyPatient, done);
        });
      }).catch(done);
    });

    it('should fetch all scoped instances', function(done) {
      Physician.create(function(err, physician) {
        physician.patients.create({ name: 'a' }, function() {
          physician.patients.create({ name: 'z' }, function() {
            physician.patients.create({ name: 'c' }, function() {
              verify(physician);
            });
          });
        });
      });
      function verify(physician) {
        physician.patients(function(err, ch) {
          var patients = physician.patients();
          patients.should.eql(ch);

          should.not.exist(err);
          should.exist(ch);
          ch.should.have.lengthOf(3);
          done();
        });
      }
    });

    it('should fetch all scoped instances with promises', function(done) {
      Physician.create()
      .then(function(physician) {
        return physician.patients.create({ name: 'a' })
        .then(function() {
          return physician.patients.create({ name: 'z' });
        })
        .then(function() {
          return physician.patients.create({ name: 'c' });
        })
        .then(function() {
          return verify(physician);
        });
      }).catch(done);
      function verify(physician) {
        return physician.patients.getAsync()
        .then(function(ch) {
          var patients = physician.patients();
          patients.should.eql(ch);

          should.exist(ch);
          ch.should.have.lengthOf(3);
          done();
        });
      }
    });

    it('should fetch scoped instances with paging filters', function(done) {
      Physician.create(function(err, physician) {
        physician.patients.create({ name: 'a' }, function() {
          physician.patients.create({ name: 'z' }, function() {
            physician.patients.create({ name: 'c' }, function() {
              verify(physician);
            });
          });
        });
      });
      function verify(physician) {
        //limit plus skip
        physician.patients({ limit: 1, skip: 1 }, function(err, ch) {
          should.not.exist(err);
          should.exist(ch);
          ch.should.have.lengthOf(1);
          ch[0].name.should.eql('z');
          //offset plus skip
          physician.patients({ limit: 1, offset: 1 }, function(err1, ch1) {
            should.not.exist(err1);
            should.exist(ch1);
            ch1.should.have.lengthOf(1);
            ch1[0].name.should.eql('z');
            //order
            physician.patients({ order: 'patientId DESC' }, function(err2, ch2) {
              should.not.exist(err2);
              should.exist(ch2);
              ch2.should.have.lengthOf(3);
              ch2[0].name.should.eql('c');
              done();
            });
          });
        });
      }
    });

    it('should find scoped record', function(done) {
      var id;
      Physician.create(function(err, physician) {
        physician.patients.create({ name: 'a' }, function(err, ch) {
          id = ch.id;
          physician.patients.create({ name: 'z' }, function() {
            physician.patients.create({ name: 'c' }, function() {
              verify(physician);
            });
          });
        });
      });

      function verify(physician) {
        physician.patients.findById(id, function(err, ch) {
          should.not.exist(err);
          should.exist(ch);
          ch.id.should.eql(id);
          done();
        });
      }
    });

    it('should find scoped record with promises', function(done) {
      var id;
      Physician.create()
      .then(function(physician) {
        return physician.patients.create({ name: 'a' })
        .then(function(ch) {
          id = ch.id;
          return physician.patients.create({ name: 'z' });
        })
        .then(function() {
          return physician.patients.create({ name: 'c' });
        })
        .then(function() {
          return verify(physician);
        });
      }).catch(done);

      function verify(physician) {
        return physician.patients.findById(id, function(err, ch) {
          should.not.exist(err);
          should.exist(ch);
          ch.id.should.eql(id);
          done();
        });
      }
    });

    it('should allow to use include syntax on related data', function(done) {
      Physician.create(function(err, physician) {
        physician.patients.create({ name: 'a' }, function(err, patient) {
          Address.create({ name: 'z' }, function(err, address) {
            should.not.exist(err);
            patient.address(address);
            patient.save(function() {
              verify(physician, address.id);
            });
          });
        });
      });
      function verify(physician, addressId) {
        physician.patients({ include: 'address' }, function(err, ch) {
          should.not.exist(err);
          should.exist(ch);
          ch.should.have.lengthOf(1);
          ch[0].addressId.should.eql(addressId);
          var address = ch[0].address();
          should.exist(address);
          address.should.be.an.instanceof(Address);
          address.name.should.equal('z');
          done();
        });
      }
    });

    it('should allow to use include syntax on related data with promises', function(done) {
      Physician.create()
      .then(function(physician) {
        return physician.patients.create({ name: 'a' })
        .then(function(patient) {
          return Address.create({ name: 'z' })
          .then(function(address) {
            patient.address(address);
            return patient.save()
            .then(function() {
              return verify(physician, address.id);
            });
          });
        });
      }).catch(done);

      function verify(physician, addressId) {
        return physician.patients.getAsync({ include: 'address' })
        .then(function(ch) {
          should.exist(ch);
          ch.should.have.lengthOf(1);
          ch[0].addressId.should.eql(addressId);
          var address = ch[0].address();
          should.exist(address);
          address.should.be.an.instanceof(Address);
          address.name.should.equal('z');
          done();
        });
      }
    });

    it('should set targetClass on scope property', function() {
      should.equal(Physician.prototype.patients._targetClass, 'Patient');
    });

    it('should update scoped record', function(done) {
      var id;
      Physician.create(function(err, physician) {
        physician.patients.create({ name: 'a' }, function(err, ch) {
          id = ch.id;
          physician.patients.updateById(id, { name: 'aa' }, function(err, ch) {
            verify(physician);
          });
        });
      });

      function verify(physician) {
        physician.patients.findById(id, function(err, ch) {
          should.not.exist(err);
          should.exist(ch);
          ch.id.should.eql(id);
          ch.name.should.equal('aa');
          done();
        });
      }
    });

    it('should update scoped record with promises', function(done) {
      var id;
      Physician.create()
      .then(function(physician) {
        return physician.patients.create({ name: 'a' })
        .then(function(ch) {
          id = ch.id;
          return physician.patients.updateById(id, { name: 'aa' })
          .then(function(ch) {
            return verify(physician);
          });
        });
      }).catch(done);

      function verify(physician) {
        return physician.patients.findById(id)
        .then(function(ch) {
          should.exist(ch);
          ch.id.should.eql(id);
          ch.name.should.equal('aa');
          done();
        });
      }
    });

    it('should destroy scoped record', function(done) {
      var id;
      Physician.create(function(err, physician) {
        physician.patients.create({ name: 'a' }, function(err, ch) {
          id = ch.id;
          physician.patients.destroy(id, function(err, ch) {
            verify(physician);
          });
        });
      });

      function verify(physician) {
        physician.patients.findById(id, function(err, ch) {
          should.exist(err);
          done();
        });
      }
    });

    it('should destroy scoped record with promises', function(done) {
      var id;
      Physician.create()
      .then(function(physician) {
        return physician.patients.create({ name: 'a' })
        .then(function(ch) {
          id = ch.id;
          return physician.patients.destroy(id)
          .then(function(ch) {
            return verify(physician);
          });
        });
      }).catch(done);

      function verify(physician) {
        return physician.patients.findById(id)
        .then(function(ch) {
          should.not.exist(ch);
          done();
        })
        .catch(function(err) {
          should.exist(err);
          done();
        });
      }
    });

    it('should check existence of a scoped record', function(done) {
      var id;
      Physician.create(function(err, physician) {
        physician.patients.create({ name: 'a' }, function(err, ch) {
          should.not.exist(err);
          id = ch.id;
          physician.patients.create({ name: 'z' }, function() {
            physician.patients.create({ name: 'c' }, function() {
              verify(physician);
            });
          });
        });
      });

      function verify(physician) {
        physician.patients.exists(id, function(err, flag) {
          should.not.exist(err);
          flag.should.be.eql(true);
          done();
        });
      }
    });

    it('should check existence of a scoped record with promises', function(done) {
      var id;
      Physician.create()
      .then(function(physician) {
        return physician.patients.create({ name: 'a' })
        .then(function(ch) {
          id = ch.id;
          return physician.patients.create({ name: 'z' });
        })
        .then(function() {
          return physician.patients.create({ name: 'c' });
        })
        .then(function() {
          return verify(physician);
        });
      }).catch(done);

      function verify(physician) {
        return physician.patients.exists(id)
        .then(function(flag) {
          flag.should.be.eql(true);
          done();
        });
      }
    });

    it('should allow to add connection with instance', function(done) {
      Physician.create({ name: 'ph1' }, function(e, physician) {
        Patient.create({ name: 'pa1' }, function(e, patient) {
          physician.patients.add(patient, function(e, app) {
            should.not.exist(e);
            should.exist(app);
            app.should.be.an.instanceOf(Appointment);
            app.physicianId.should.eql(physician.id);
            app.patientId.should.eql(patient.id);
            done();
          });
        });
      });
    });

    it('should allow to add connection with instance with promises', function(done) {
      Physician.create({ name: 'ph1' })
      .then(function(physician) {
        return Patient.create({ name: 'pa1' })
        .then(function(patient) {
          return physician.patients.add(patient)
          .then(function(app) {
            should.exist(app);
            app.should.be.an.instanceOf(Appointment);
            app.physicianId.should.eql(physician.id);
            app.patientId.should.eql(patient.id);
            done();
          });
        });
      }).catch(done);
    });

    it('should allow to add connection with through data', function(done) {
      Physician.create({ name: 'ph1' }, function(e, physician) {
        Patient.create({ name: 'pa1' }, function(e, patient) {
          var now = Date.now();
          physician.patients.add(patient, { date: new Date(now) }, function(e, app) {
            should.not.exist(e);
            should.exist(app);
            app.should.be.an.instanceOf(Appointment);
            app.physicianId.should.eql(physician.id);
            app.patientId.should.eql(patient.id);
            app.patientId.should.eql(patient.id);
            app.date.getTime().should.equal(now);
            done();
          });
        });
      });
    });

    it('should allow to add connection with through data with promises', function(done) {
      Physician.create({ name: 'ph1' })
      .then(function(physician) {
        return Patient.create({ name: 'pa1' })
        .then(function(patient) {
          var now = Date.now();
          return physician.patients.add(patient, { date: new Date(now) })
          .then(function(app) {
            should.exist(app);
            app.should.be.an.instanceOf(Appointment);
            app.physicianId.should.eql(physician.id);
            app.patientId.should.eql(patient.id);
            app.patientId.should.eql(patient.id);
            app.date.getTime().should.equal(now);
            done();
          });
        });
      }).catch(done);
    });

    it('should allow to remove connection with instance', function(done) {
      var id;
      Physician.create(function(err, physician) {
        physician.patients.create({ name: 'a' }, function(err, patient) {
          id = patient.id;
          physician.patients.remove(id, function(err, ch) {
            verify(physician);
          });
        });
      });

      function verify(physician) {
        physician.patients.exists(id, function(err, flag) {
          should.not.exist(err);
          flag.should.be.eql(false);
          done();
        });
      }
    });

    it('should allow to remove connection with instance with promises', function(done) {
      var id;
      Physician.create()
      .then(function(physician) {
        return physician.patients.create({ name: 'a' })
        .then(function(patient) {
          id = patient.id;
          return physician.patients.remove(id)
          .then(function(ch) {
            return verify(physician);
          });
        });
      }).catch(done);

      function verify(physician) {
        return physician.patients.exists(id)
        .then(function(flag) {
          flag.should.be.eql(false);
          done();
        });
      }
    });

    beforeEach(function(done) {
      Appointment.destroyAll(function(err) {
        Physician.destroyAll(function(err) {
          Patient.destroyAll(done);
        });
      });
    });
  });

  describe('hasMany through - collect', function() {
    var Physician, Patient, Appointment, Address;

    beforeEach(function(done) {
      // db = getSchema();
      Physician = db.define('Physician', { name: String });
      Patient = db.define('Patient', { name: String });
      Appointment = db.define('Appointment', { date: { type: Date,
        default: function() {
          return new Date();
        } }});
      Address = db.define('Address', { name: String });

      db.automigrate(['Physician', 'Patient', 'Appointment', 'Address'], done);
    });

    describe('with default options', function() {
      it('can determine the collect by modelTo\'s name as default', function() {
        Physician.hasMany(Patient, { through: Appointment });
        Patient.hasMany(Physician, { through: Appointment, as: 'yyy' });
        Patient.belongsTo(Address);
        Appointment.belongsTo(Physician);
        Appointment.belongsTo(Patient);
        var physician = new Physician({ id: 1 });
        var scope1 = physician.patients._scope;
        scope1.should.have.property('collect', 'patient');
        scope1.should.have.property('include', 'patient');
        var patient = new Patient({ id: 1 });
        var scope2 = patient.yyy._scope;
        scope2.should.have.property('collect', 'physician');
        scope2.should.have.property('include', 'physician');
      });
    });

    describe('when custom reverse belongsTo names for both sides', function() {
      it('can determine the collect via keyThrough', function() {
        Physician.hasMany(Patient, {
          through: Appointment,
          foreignKey: 'fooId',
          keyThrough: 'barId',
        });
        Patient.hasMany(Physician, {
          through: Appointment,
          foreignKey: 'barId',
          keyThrough: 'fooId',
          as: 'yyy',
        });
        Appointment.belongsTo(Physician, { as: 'foo' });
        Appointment.belongsTo(Patient, { as: 'bar' });
        Patient.belongsTo(Address); // jam.
        Appointment.belongsTo(Patient, { as: 'car' }); // jam. Should we complain in this case???

        var physician = new Physician({ id: 1 });
        var scope1 = physician.patients._scope;
        scope1.should.have.property('collect', 'bar');
        scope1.should.have.property('include', 'bar');
        var patient = new Patient({ id: 1 });
        var scope2 = patient.yyy._scope;
        scope2.should.have.property('collect', 'foo');
        scope2.should.have.property('include', 'foo');
      });

      it('can determine the collect via modelTo name', function() {
        Physician.hasMany(Patient, { through: Appointment });
        Patient.hasMany(Physician, { through: Appointment, as: 'yyy' });
        Appointment.belongsTo(Physician, { as: 'foo', foreignKey: 'physicianId' });
        Appointment.belongsTo(Patient, { as: 'bar', foreignKey: 'patientId' });
        Patient.belongsTo(Address); // jam.

        var physician = new Physician({ id: 1 });
        var scope1 = physician.patients._scope;
        scope1.should.have.property('collect', 'bar');
        scope1.should.have.property('include', 'bar');
        var patient = new Patient({ id: 1 });
        var scope2 = patient.yyy._scope;
        scope2.should.have.property('collect', 'foo');
        scope2.should.have.property('include', 'foo');
      });

      it('can determine the collect via modelTo name (with jams)', function() {
        Physician.hasMany(Patient, { through: Appointment });
        Patient.hasMany(Physician, { through: Appointment, as: 'yyy' });
        Appointment.belongsTo(Physician, { as: 'foo', foreignKey: 'physicianId' });
        Appointment.belongsTo(Patient, { as: 'bar', foreignKey: 'patientId' });
        Patient.belongsTo(Address); // jam.
        Appointment.belongsTo(Physician, { as: 'goo', foreignKey: 'physicianId' }); // jam. Should we complain in this case???
        Appointment.belongsTo(Patient, { as: 'car', foreignKey: 'patientId' }); // jam. Should we complain in this case???

        var physician = new Physician({ id: 1 });
        var scope1 = physician.patients._scope;
        scope1.should.have.property('collect', 'bar');
        scope1.should.have.property('include', 'bar');
        var patient = new Patient({ id: 1 });
        var scope2 = patient.yyy._scope;
        scope2.should.have.property('collect', 'foo'); // first matched relation
        scope2.should.have.property('include', 'foo'); // first matched relation
      });
    });

    describe('when custom reverse belongsTo name for one side only', function() {
      beforeEach(function() {
        Physician.hasMany(Patient, { as: 'xxx', through: Appointment, foreignKey: 'fooId' });
        Patient.hasMany(Physician, { as: 'yyy', through: Appointment, keyThrough: 'fooId' });
        Appointment.belongsTo(Physician, { as: 'foo' });
        Appointment.belongsTo(Patient);
        Patient.belongsTo(Address); // jam.
        Appointment.belongsTo(Physician, { as: 'bar' }); // jam. Should we complain in this case???
      });

      it('can determine the collect via model name', function() {
        var physician = new Physician({ id: 1 });
        var scope1 = physician.xxx._scope;
        scope1.should.have.property('collect', 'patient');
        scope1.should.have.property('include', 'patient');
      });

      it('can determine the collect via keyThrough', function() {
        var patient = new Patient({ id: 1 });
        var scope2 = patient.yyy._scope;
        scope2.should.have.property('collect', 'foo');
        scope2.should.have.property('include', 'foo');
      });
    });
  });

  describe('hasMany through bi-directional relations on the same model', function() {
    var User, Follow, Address;

    before(function(done) {
      // db = getSchema();
      User = db.define('User', { name: String });
      Follow = db.define('Follow', { date: { type: Date,
        default: function() {
          return new Date();
        } }});
      Address = db.define('Address', { name: String });

      User.hasMany(User, {
        as: 'followers',
        foreignKey: 'followeeId',
        keyThrough: 'followerId',
        through: Follow,
      });
      User.hasMany(User, {
        as: 'following',
        foreignKey: 'followerId',
        keyThrough: 'followeeId',
        through: Follow,
      });
      User.belongsTo(Address);
      Follow.belongsTo(User, { as: 'follower' });
      Follow.belongsTo(User, { as: 'followee' });
      db.automigrate(['User', 'Follow'], done);
    });

    it('should set foreignKeys of through model correctly in first relation',
      function(done) {
        var follower = new User({ id: 1 });
        var followee = new User({ id: 2 });
        followee.followers.add(follower, function(err, throughInst) {
          should.not.exist(err);
          should.exist(throughInst);
          throughInst.followerId.should.eql(follower.id);
          throughInst.followeeId.should.eql(followee.id);
          done();
        });
      });

    it('should set foreignKeys of through model correctly in second relation',
      function(done) {
        var follower = new User({ id: 3 });
        var followee = new User({ id: 4 });
        follower.following.add(followee, function(err, throughInst) {
          should.not.exist(err);
          should.exist(throughInst);
          throughInst.followeeId.should.eql(followee.id);
          throughInst.followerId.should.eql(follower.id);
          done();
        });
      });
  });

  describe('hasMany through - between same models', function() {
    var User, Follow, Address;

    before(function(done) {
      // db = getSchema();
      User = db.define('User', { name: String });
      Follow = db.define('Follow', { date: { type: Date,
        default: function() {
          return new Date();
        } }});
      Address = db.define('Address', { name: String });

      User.hasMany(User, {
        as: 'followers',
        foreignKey: 'followeeId',
        keyThrough: 'followerId',
        through: Follow,
      });
      User.hasMany(User, {
        as: 'following',
        foreignKey: 'followerId',
        keyThrough: 'followeeId',
        through: Follow,
      });
      User.belongsTo(Address);
      Follow.belongsTo(User, { as: 'follower' });
      Follow.belongsTo(User, { as: 'followee' });
      db.automigrate(['User', 'Follow', 'Address'], done);
    });

    it('should set the keyThrough and the foreignKey', function(done) {
      var user = new User({ id: 1 });
      var user2 = new User({ id: 2 });
      user.following.add(user2, function(err, f) {
        should.not.exist(err);
        should.exist(f);
        f.followeeId.should.eql(user2.id);
        f.followerId.should.eql(user.id);
        done();
      });
    });

    it('can determine the collect via keyThrough for each side', function() {
      var user = new User({ id: 1 });
      var scope1 = user.followers._scope;
      scope1.should.have.property('collect', 'follower');
      scope1.should.have.property('include', 'follower');
      var scope2 = user.following._scope;
      scope2.should.have.property('collect', 'followee');
      scope2.should.have.property('include', 'followee');
    });
  });

  describe('hasMany with properties', function() {
    it('can be declared with properties', function(done) {
      Book.hasMany(Chapter, { properties: { type: 'bookType' }});
      db.automigrate(['Book', 'Chapter'], done);
    });

    it('should create record on scope', function(done) {
      Book.create({ type: 'fiction' }, function(err, book) {
        book.chapters.create(function(err, c) {
          should.not.exist(err);
          should.exist(c);
          c.bookId.should.eql(book.id);
          c.bookType.should.equal('fiction');
          done();
        });
      });
    });

    it('should create record on scope with promises', function(done) {
      Book.create({ type: 'fiction' })
      .then(function(book) {
        return book.chapters.create()
        .then(function(c) {
          should.exist(c);
          c.bookId.should.eql(book.id);
          c.bookType.should.equal('fiction');
          done();
        });
      }).catch(done);
    });
  });

  describe('hasMany with scope and properties', function() {
    it('can be declared with properties', function(done) {
      // db = getSchema();
      Category = db.define('Category', { name: String, jobType: String });
      Job = db.define('Job', { name: String, type: String });

      Category.hasMany(Job, {
        properties: function(inst, target) {
          if (!inst.jobType) return; // skip
          return { type: inst.jobType };
        },
        scope: function(inst, filter) {
          var m = this.properties(inst); // re-use properties
          if (m) return { where: m };
        },
      });
      db.automigrate(['Category', 'Job'], done);
    });

    it('should create record on scope', function(done) {
      Category.create(function(err, c) {
        should.not.exists(err);
        c.jobs.create({ type: 'book' }, function(err, p) {
          should.not.exists(err);
          p.categoryId.should.eql(c.id);
          p.type.should.equal('book');
          c.jobs.create({ type: 'widget' }, function(err, p) {
            should.not.exists(err);
            p.categoryId.should.eql(c.id);
            p.type.should.equal('widget');
            done();
          });
        });
      });
    });

    it('should create record on scope with promises', function(done) {
      Category.create()
      .then(function(c) {
        return c.jobs.create({ type: 'book' })
        .then(function(p) {
          p.categoryId.should.eql(c.id);
          p.type.should.equal('book');
          return c.jobs.create({ type: 'widget' })
          .then(function(p) {
            p.categoryId.should.eql(c.id);
            p.type.should.equal('widget');
            done();
          });
        });
      }).catch(done);
    });

    it('should find records on scope', function(done) {
      Category.findOne(function(err, c) {
        should.not.exists(err);
        c.jobs(function(err, jobs) {
          should.not.exists(err);
          jobs.should.have.length(2);
          done();
        });
      });
    });

    it('should find records on scope with promises', function(done) {
      Category.findOne()
      .then(function(c) {
        return c.jobs.getAsync();
      })
      .then(function(jobs) {
        jobs.should.have.length(2);
        done();
      })
      .catch(done);
    });

    it('should find record on scope - filtered', function(done) {
      Category.findOne(function(err, c) {
        should.not.exists(err);
        c.jobs({ where: { type: 'book' }}, function(err, jobs) {
          should.not.exists(err);
          jobs.should.have.length(1);
          jobs[0].type.should.equal('book');
          done();
        });
      });
    });

    it('should find record on scope with promises - filtered', function(done) {
      Category.findOne()
      .then(function(c) {
        return c.jobs.getAsync({ where: { type: 'book' }});
      })
      .then(function(jobs) {
        jobs.should.have.length(1);
        jobs[0].type.should.equal('book');
        done();
      })
      .catch(done);
    });

    // So why not just do the above? In LoopBack, the context
    // that gets passed into a beforeRemote handler contains
    // a reference to the parent scope/instance: ctx.instance
    // in order to enforce a (dynamic scope) at runtime
    // a temporary property can be set in the beforeRemoting
    // handler. Optionally,properties dynamic properties can be declared.
    //
    // The code below simulates this.

    it('should create record on scope - properties', function(done) {
      Category.findOne(function(err, c) {
        should.not.exists(err);
        c.jobType = 'tool'; // temporary
        c.jobs.create(function(err, p) {
          p.categoryId.should.eql(c.id);
          p.type.should.equal('tool');
          done();
        });
      });
    });

    it('should find records on scope', function(done) {
      Category.findOne(function(err, c) {
        should.not.exists(err);
        c.jobs(function(err, jobs) {
          should.not.exists(err);
          jobs.should.have.length(3);
          done();
        });
      });
    });

    it('should find record on scope - scoped', function(done) {
      Category.findOne(function(err, c) {
        should.not.exists(err);
        c.jobType = 'book'; // temporary, for scoping
        c.jobs(function(err, jobs) {
          should.not.exists(err);
          jobs.should.have.length(1);
          jobs[0].type.should.equal('book');
          done();
        });
      });
    });

    it('should find record on scope - scoped', function(done) {
      Category.findOne(function(err, c) {
        should.not.exists(err);
        c.jobType = 'tool'; // temporary, for scoping
        c.jobs(function(err, jobs) {
          should.not.exists(err);
          jobs.should.have.length(1);
          jobs[0].type.should.equal('tool');
          done();
        });
      });
    });

    it('should find count of records on scope - scoped', function(done) {
      Category.findOne(function(err, c) {
        should.not.exists(err);
        c.jobType = 'tool'; // temporary, for scoping
        c.jobs.count(function(err, count) {
          should.not.exists(err);
          count.should.equal(1);
          done();
        });
      });
    });

    it('should delete records on scope - scoped', function(done) {
      Category.findOne(function(err, c) {
        should.not.exists(err);
        c.jobType = 'tool'; // temporary, for scoping
        c.jobs.destroyAll(function(err, result) {
          done(err);
        });
      });
    });

    it('should find record on scope - verify', function(done) {
      Category.findOne(function(err, c) {
        should.not.exists(err);
        c.jobs(function(err, jobs) {
          should.not.exists(err);
          jobs.should.have.length(2);
          done();
        });
      });
    });
  });

  describe('polymorphic hasOne', function() {
    before(function(done) {
      // db = getSchema();
      Picture = db.define('Picture', { name: String });
      Author = db.define('Author', { name: String });
      Reader = db.define('Reader', { name: String });

      db.automigrate(['Picture', 'Author', 'Reader'], done);
    });

    it('can be declared', function(done) {
      Author.hasOne(Picture, { as: 'avatar', polymorphic: 'imageable' });
      Reader.hasOne(Picture, { as: 'mugshot', polymorphic: 'imageable' });
      Picture.belongsTo('imageable', { polymorphic: true });
      db.automigrate(['Picture', 'Author', 'Reader'], done);
    });

    it('should create polymorphic relation - author', function(done) {
      Author.create({ name: 'Author 1' }, function(err, author) {
        should.not.exists(err);
        author.avatar.create({ name: 'Avatar' }, function(err, p) {
          should.not.exist(err);
          should.exist(p);
          p.imageableId.should.eql(author.id);
          p.imageableType.should.equal('Author');
          done();
        });
      });
    });

    it('should create polymorphic relation with promises - author', function(done) {
      Author.create({ name: 'Author 1' })
      .then(function(author) {
        return author.avatar.create({ name: 'Avatar' })
        .then(function(p) {
          should.exist(p);
          p.imageableId.should.eql(author.id);
          p.imageableType.should.equal('Author');
          done();
        });
      }).catch(done);
    });

    it('should create polymorphic relation - reader', function(done) {
      Reader.create({ name: 'Reader 1' }, function(err, reader) {
        should.not.exists(err);
        reader.mugshot.create({ name: 'Mugshot' }, function(err, p) {
          should.not.exist(err);
          should.exist(p);
          p.imageableId.should.eql(reader.id);
          p.imageableType.should.equal('Reader');
          done();
        });
      });
    });

    it('should find polymorphic relation - author', function(done) {
      Author.findOne(function(err, author) {
        should.not.exists(err);
        author.avatar(function(err, p) {
          should.not.exist(err);

          var avatar = author.avatar();
          avatar.should.equal(p);

          p.name.should.equal('Avatar');
          p.imageableId.should.eql(author.id);
          p.imageableType.should.equal('Author');
          done();
        });
      });
    });

    it('should find polymorphic relation - reader', function(done) {
      Reader.findOne(function(err, reader) {
        should.not.exists(err);
        reader.mugshot(function(err, p) {
          should.not.exist(err);
          p.name.should.equal('Mugshot');
          p.imageableId.should.eql(reader.id);
          p.imageableType.should.equal('Reader');
          done();
        });
      });
    });

    it('should include polymorphic relation - author', function(done) {
      Author.findOne({ include: 'avatar' }, function(err, author) {
        should.not.exists(err);
        var avatar = author.avatar();
        should.exist(avatar);
        avatar.name.should.equal('Avatar');
        done();
      });
    });

    it('should find polymorphic relation with promises - reader', function(done) {
      Reader.findOne()
      .then(function(reader) {
        return reader.mugshot.getAsync()
        .then(function(p) {
          p.name.should.equal('Mugshot');
          p.imageableId.should.eql(reader.id);
          p.imageableType.should.equal('Reader');
          done();
        });
      }).catch(done);
    });

    it('should find inverse polymorphic relation - author', function(done) {
      Picture.findOne({ where: { name: 'Avatar' }}, function(err, p) {
        should.not.exists(err);
        p.imageable(function(err, imageable) {
          should.not.exist(err);
          imageable.should.be.instanceof(Author);
          imageable.name.should.equal('Author 1');
          done();
        });
      });
    });

    it('should include inverse polymorphic relation - author', function(done) {
      Picture.findOne({ where: { name: 'Avatar' }, include: 'imageable' },
        function(err, p) {
          should.not.exists(err);
          var imageable = p.imageable();
          should.exist(imageable);
          imageable.should.be.instanceof(Author);
          imageable.name.should.equal('Author 1');
          done();
        });
    });

    it('should find inverse polymorphic relation - reader', function(done) {
      Picture.findOne({ where: { name: 'Mugshot' }}, function(err, p) {
        should.not.exists(err);
        p.imageable(function(err, imageable) {
          should.not.exist(err);
          imageable.should.be.instanceof(Reader);
          imageable.name.should.equal('Reader 1');
          done();
        });
      });
    });
  });

  describe('polymorphic hasOne with non standard ids', function() {
    before(function(done) {
      // db = getSchema();
      Picture = db.define('Picture', { name: String });
      Author = db.define('Author', {
        username: { type: String, id: true, generated: true },
        name: String,
      });
      Reader = db.define('Reader', {
        username: { type: String, id: true, generated: true },
        name: String,
      });

      db.automigrate(['Picture', 'Author', 'Reader'], done);
    });

    it('can be declared with non standard foreign key', function(done) {
      Author.hasOne(Picture, {
        as: 'avatar',
        polymorphic: {
          foreignKey: 'oid',
          discriminator: 'type',
        },
      });
      Reader.hasOne(Picture, {
        as: 'mugshot',
        polymorphic: {
          foreignKey: 'oid',
          discriminator: 'type',
        },
      });
      Picture.belongsTo('owner', {
        idName: 'username',
        polymorphic: {
          idType: Author.definition.properties.username.type,
          foreignKey: 'oid',
          discriminator: 'type',
        },
      });
      db.automigrate(['Picture', 'Author', 'Reader'], done);
    });

    it('should create polymorphic relation - author', function(done) {
      Author.create({ name: 'Author 1' }, function(err, author) {
        should.not.exists(err);
        author.avatar.create({ name: 'Avatar' }, function(err, p) {
          should.not.exist(err);
          should.exist(p);
          p.oid.toString().should.equal(author.username.toString());
          p.type.should.equal('Author');
          done();
        });
      });
    });

    it('should create polymorphic relation with promises - author', function(done) {
      Author.create({ name: 'Author 1' })
      .then(function(author) {
        return author.avatar.create({ name: 'Avatar' })
        .then(function(p) {
          should.exist(p);
          p.oid.toString().should.equal(author.username.toString());
          p.type.should.equal('Author');
          done();
        });
      }).catch(done);
    });

    it('should create polymorphic relation - reader', function(done) {
      Reader.create({ name: 'Reader 1' }, function(err, reader) {
        should.not.exists(err);
        reader.mugshot.create({ name: 'Mugshot' }, function(err, p) {
          should.not.exist(err);
          should.exist(p);
          p.oid.toString().should.equal(reader.username.toString());
          p.type.should.equal('Reader');
          done();
        });
      });
    });

    it('should find polymorphic relation - author', function(done) {
      Author.findOne(function(err, author) {
        should.not.exists(err);
        author.avatar(function(err, p) {
          should.not.exist(err);

          var avatar = author.avatar();
          avatar.should.equal(p);

          p.name.should.equal('Avatar');
          p.oid.toString().should.equal(author.username.toString());
          p.type.should.equal('Author');
          done();
        });
      });
    });

    it('should find polymorphic relation - reader', function(done) {
      Reader.findOne(function(err, reader) {
        should.not.exists(err);
        reader.mugshot(function(err, p) {
          should.not.exist(err);
          p.name.should.equal('Mugshot');
          p.oid.toString().should.equal(reader.username.toString());
          p.type.should.equal('Reader');
          done();
        });
      });
    });

    it('should find inverse polymorphic relation - author', function(done) {
      Picture.findOne({ where: { name: 'Avatar' }}, function(err, p) {
        should.not.exists(err);
        p.owner(function(err, owner) {
          should.not.exist(err);
          owner.should.be.instanceof(Author);
          owner.name.should.equal('Author 1');
          done();
        });
      });
    });

    it('should find inverse polymorphic relation - reader', function(done) {
      Picture.findOne({ where: { name: 'Mugshot' }}, function(err, p) {
        should.not.exists(err);
        p.owner(function(err, owner) {
          should.not.exist(err);
          owner.should.be.instanceof(Reader);
          owner.name.should.equal('Reader 1');
          done();
        });
      });
    });

    it('should include polymorphic relation - reader', function(done) {
      Reader.findOne({ include: 'mugshot' },
        function(err, reader) {
          should.not.exists(err);
          var mugshot = reader.mugshot();
          should.exist(mugshot);
          mugshot.name.should.equal('Mugshot');
          done();
        });
    });

    it('should include inverse polymorphic relation - reader', function(done) {
      Picture.findOne({ where: { name: 'Mugshot' }, include: 'owner' },
        function(err, p) {
          should.not.exists(err);
          var owner = p.owner();
          should.exist(owner);
          owner.should.be.instanceof(Reader);
          owner.name.should.equal('Reader 1');
          done();
        });
    });
  });

  describe('polymorphic hasMany', function() {
    before(function(done) {
      // db = getSchema();
      Picture = db.define('Picture', { name: String });
      Author = db.define('Author', { name: String });
      Reader = db.define('Reader', { name: String });

      db.automigrate(['Picture', 'Author', 'Reader'], done);
    });

    it('can be declared', function(done) {
      Author.hasMany(Picture, { polymorphic: 'imageable' });
      Reader.hasMany(Picture, { polymorphic: { // alt syntax
        as: 'imageable', foreignKey: 'imageableId',
        discriminator: 'imageableType',
      }});
      Picture.belongsTo('imageable', { polymorphic: true });

      Author.relations['pictures'].toJSON().should.eql({
        name: 'pictures',
        type: 'hasMany',
        modelFrom: 'Author',
        keyFrom: 'id',
        modelTo: 'Picture',
        keyTo: 'imageableId',
        multiple: true,
        polymorphic: {
          as: 'imageable',
          foreignKey: 'imageableId',
          discriminator: 'imageableType',
        },
      });

      Picture.relations['imageable'].toJSON().should.eql({
        name: 'imageable',
        type: 'belongsTo',
        modelFrom: 'Picture',
        keyFrom: 'imageableId',
        modelTo: '<polymorphic>',
        keyTo: 'id',
        multiple: false,
        polymorphic: {
          as: 'imageable',
          foreignKey: 'imageableId',
          discriminator: 'imageableType',
        },
      });

      db.automigrate(['Picture', 'Author', 'Reader'], done);
    });

    it('should create polymorphic relation - author', function(done) {
      Author.create({ name: 'Author 1' }, function(err, author) {
        should.not.exists(err);
        author.pictures.create({ name: 'Author Pic' }, function(err, p) {
          should.not.exist(err);
          should.exist(p);
          p.imageableId.should.eql(author.id);
          p.imageableType.should.equal('Author');
          done();
        });
      });
    });

    it('should create polymorphic relation - reader', function(done) {
      Reader.create({ name: 'Reader 1' }, function(err, reader) {
        should.not.exists(err);
        reader.pictures.create({ name: 'Reader Pic' }, function(err, p) {
          should.not.exist(err);
          should.exist(p);
          p.imageableId.should.eql(reader.id);
          p.imageableType.should.equal('Reader');
          done();
        });
      });
    });

    it('should find polymorphic items - author', function(done) {
      Author.findOne(function(err, author) {
        should.not.exists(err);
        author.pictures(function(err, pics) {
          should.not.exist(err);

          var pictures = author.pictures();
          pictures.should.eql(pics);

          pics.should.have.length(1);
          pics[0].name.should.equal('Author Pic');
          done();
        });
      });
    });

    it('should find polymorphic items - reader', function(done) {
      Reader.findOne(function(err, reader) {
        should.not.exists(err);
        reader.pictures(function(err, pics) {
          should.not.exist(err);
          pics.should.have.length(1);
          pics[0].name.should.equal('Reader Pic');
          done();
        });
      });
    });

    it('should find the inverse of polymorphic relation - author', function(done) {
      Picture.findOne({ where: { name: 'Author Pic' }}, function(err, p) {
        should.not.exist(err);
        p.imageableType.should.equal('Author');
        p.imageable(function(err, imageable) {
          should.not.exist(err);
          imageable.should.be.instanceof(Author);
          imageable.name.should.equal('Author 1');
          done();
        });
      });
    });

    it('should find the inverse of polymorphic relation - reader', function(done) {
      Picture.findOne({ where: { name: 'Reader Pic' }}, function(err, p) {
        should.not.exist(err);
        p.imageableType.should.equal('Reader');
        p.imageable(function(err, imageable) {
          should.not.exist(err);
          imageable.should.be.instanceof(Reader);
          imageable.name.should.equal('Reader 1');
          done();
        });
      });
    });

    it('should include the inverse of polymorphic relation', function(done) {
      Picture.find({ include: 'imageable' }, function(err, pics) {
        should.not.exist(err);
        pics.should.have.length(2);
        pics[0].name.should.equal('Author Pic');
        pics[0].imageable().name.should.equal('Author 1');
        pics[1].name.should.equal('Reader Pic');
        pics[1].imageable().name.should.equal('Reader 1');
        done();
      });
    });

    it('should assign a polymorphic relation', function(done) {
      Author.create({ name: 'Author 2' }, function(err, author) {
        should.not.exists(err);
        var p = new Picture({ name: 'Sample' });
        p.imageable(author); // assign
        p.imageableId.should.eql(author.id);
        p.imageableType.should.equal('Author');
        p.save(done);
      });
    });

    it('should find polymorphic items - author', function(done) {
      Author.findOne({ where: { name: 'Author 2' }}, function(err, author) {
        should.not.exists(err);
        author.pictures(function(err, pics) {
          should.not.exist(err);
          pics.should.have.length(1);
          pics[0].name.should.equal('Sample');
          done();
        });
      });
    });

    it('should find the inverse of polymorphic relation - author', function(done) {
      Picture.findOne({ where: { name: 'Sample' }}, function(err, p) {
        should.not.exist(err);
        p.imageableType.should.equal('Author');
        p.imageable(function(err, imageable) {
          should.not.exist(err);
          imageable.should.be.instanceof(Author);
          imageable.name.should.equal('Author 2');
          done();
        });
      });
    });

    it('should include the inverse of polymorphic relation - author',
      function(done) {
        Picture.findOne({ where: { name: 'Sample' }, include: 'imageable' },
          function(err, p) {
            should.not.exist(err);
            var imageable = p.imageable();
            should.exist(imageable);
            imageable.should.be.instanceof(Author);
            imageable.name.should.equal('Author 2');
            done();
          });
      });
  });

  describe('polymorphic hasAndBelongsToMany through', function() {
    before(function(done) {
      // db = getSchema();
      Picture = db.define('Picture', { name: String });
      Author = db.define('Author', { name: String });
      Reader = db.define('Reader', { name: String });
      PictureLink = db.define('PictureLink', {});

      db.automigrate(['Picture', 'Author', 'Reader', 'PictureLink'], done);
    });

    it('can be declared', function(done) {
      Author.hasAndBelongsToMany(Picture, { through: PictureLink, polymorphic: 'imageable' });
      Reader.hasAndBelongsToMany(Picture, { through: PictureLink, polymorphic: 'imageable' });
      // Optionally, define inverse relations:
      Picture.hasMany(Author, { through: PictureLink, polymorphic: 'imageable', invert: true });
      Picture.hasMany(Reader, { through: PictureLink, polymorphic: 'imageable', invert: true });
      db.automigrate(['Picture', 'Author', 'Reader', 'PictureLink'], done);
    });

    it('can determine the collect via modelTo name', function() {
      Author.hasAndBelongsToMany(Picture, { through: PictureLink, polymorphic: 'imageable' });
      Reader.hasAndBelongsToMany(Picture, { through: PictureLink, polymorphic: 'imageable' });
      // Optionally, define inverse relations:
      Picture.hasMany(Author, { through: PictureLink, polymorphic: 'imageable', invert: true });
      Picture.hasMany(Reader, { through: PictureLink, polymorphic: 'imageable', invert: true });
      var author = new Author({ id: 1 });
      var scope1 = author.pictures._scope;
      scope1.should.have.property('collect', 'picture');
      scope1.should.have.property('include', 'picture');
      var reader = new Reader({ id: 1 });
      var scope2 = reader.pictures._scope;
      scope2.should.have.property('collect', 'picture');
      scope2.should.have.property('include', 'picture');
      var picture = new Picture({ id: 1 });
      var scope3 = picture.authors._scope;
      scope3.should.have.property('collect', 'imageable');
      scope3.should.have.property('include', 'imageable');
      var scope4 = picture.readers._scope;
      scope4.should.have.property('collect', 'imageable');
      scope4.should.have.property('include', 'imageable');
    });

    var author, reader, pictures = [];
    it('should create polymorphic relation - author', function(done) {
      Author.create({ name: 'Author 1' }, function(err, a) {
        should.not.exist(err);
        author = a;
        author.pictures.create({ name: 'Author Pic 1' }, function(err, p) {
          should.not.exist(err);
          pictures.push(p);
          author.pictures.create({ name: 'Author Pic 2' }, function(err, p) {
            should.not.exist(err);
            pictures.push(p);
            done();
          });
        });
      });
    });

    it('should create polymorphic relation - reader', function(done) {
      Reader.create({ name: 'Reader 1' }, function(err, r) {
        should.not.exist(err);
        reader = r;
        reader.pictures.create({ name: 'Reader Pic 1' }, function(err, p) {
          should.not.exist(err);
          pictures.push(p);
          done();
        });
      });
    });

    it('should create polymorphic through model', function(done) {
      PictureLink.findOne(function(err, link) {
        should.not.exist(err);
        link.pictureId.should.eql(pictures[0].id); // eql for mongo ObjectId
        link.imageableId.should.eql(author.id);
        link.imageableType.should.equal('Author');
        link.imageable(function(err, imageable) {
          imageable.should.be.instanceof(Author);
          imageable.id.should.eql(author.id);
          done();
        });
      });
    });

    it('should get polymorphic relation through model - author', function(done) {
      Author.findById(author.id, function(err, author) {
        should.not.exist(err);
        author.name.should.equal('Author 1');
        author.pictures(function(err, pics) {
          should.not.exist(err);
          pics.should.have.length(2);
          pics[0].name.should.equal('Author Pic 1');
          pics[1].name.should.equal('Author Pic 2');
          done();
        });
      });
    });

    it('should get polymorphic relation through model - reader', function(done) {
      Reader.findById(reader.id, function(err, reader) {
        should.not.exist(err);
        reader.name.should.equal('Reader 1');
        reader.pictures(function(err, pics) {
          should.not.exist(err);
          pics.should.have.length(1);
          pics[0].name.should.equal('Reader Pic 1');
          done();
        });
      });
    });

    it('should include polymorphic items', function(done) {
      Author.find({ include: 'pictures' }, function(err, authors) {
        authors.should.have.length(1);
        authors[0].pictures(function(err, pics) {
          pics.should.have.length(2);
          pics[0].name.should.equal('Author Pic 1');
          pics[1].name.should.equal('Author Pic 2');
          done();
        });
      });
    });

    var anotherPicture;
    it('should add to a polymorphic relation - author', function(done) {
      Author.findById(author.id, function(err, author) {
        Picture.create({ name: 'Example' }, function(err, p) {
          should.not.exist(err);
          pictures.push(p);
          anotherPicture = p;
          author.pictures.add(p, function(err, link) {
            link.should.be.instanceof(PictureLink);
            link.pictureId.should.eql(p.id);
            link.imageableId.should.eql(author.id);
            link.imageableType.should.equal('Author');
            done();
          });
        });
      });
    });

    it('should create polymorphic through model', function(done) {
      PictureLink.findOne({
        where: {
          pictureId: anotherPicture.id,
          imageableType: 'Author',
        },
      }, function(err, link) {
        should.not.exist(err);
        link.pictureId.should.eql(anotherPicture.id);
        link.imageableId.should.eql(author.id);
        link.imageableType.should.equal('Author');
        done();
      });
    });

    var anotherAuthor, anotherReader;
    it('should add to a polymorphic relation - author', function(done) {
      Author.create({ name: 'Author 2' }, function(err, author) {
        should.not.exist(err);
        anotherAuthor = author;
        author.pictures.add(anotherPicture.id, function(err, p) {
          should.not.exist(err);
          done();
        });
      });
    });

    it('should add to a polymorphic relation - author', function(done) {
      Reader.create({ name: 'Reader 2' }, function(err, reader) {
        should.not.exist(err);
        anotherReader = reader;
        reader.pictures.add(anotherPicture.id, function(err, p) {
          should.not.exist(err);
          done();
        });
      });
    });

    it('should get the inverse polymorphic relation - author', function(done) {
      Picture.findById(anotherPicture.id, function(err, p) {
        p.authors(function(err, authors) {
          authors.should.have.length(2);
          authors[0].name.should.equal('Author 1');
          authors[1].name.should.equal('Author 2');
          done();
        });
      });
    });

    it('should get the inverse polymorphic relation - reader', function(done) {
      Picture.findById(anotherPicture.id, function(err, p) {
        p.readers(function(err, readers) {
          readers.should.have.length(1);
          readers[0].name.should.equal('Reader 2');
          done();
        });
      });
    });

    it('should find polymorphic items - author', function(done) {
      Author.findById(author.id, function(err, author) {
        author.pictures(function(err, pics) {
          pics.should.have.length(3);
          pics[0].name.should.equal('Author Pic 1');
          pics[1].name.should.equal('Author Pic 2');
          pics[2].name.should.equal('Example');
          done();
        });
      });
    });

    it('should check if polymorphic relation exists - author', function(done) {
      Author.findById(author.id, function(err, author) {
        author.pictures.exists(anotherPicture.id, function(err, exists) {
          exists.should.be.true;
          done();
        });
      });
    });

    it('should remove from a polymorphic relation - author', function(done) {
      Author.findById(author.id, function(err, author) {
        author.pictures.remove(anotherPicture.id, function(err) {
          should.not.exist(err);
          done();
        });
      });
    });

    it('should find polymorphic items - author', function(done) {
      Author.findById(author.id, function(err, author) {
        author.pictures(function(err, pics) {
          pics.should.have.length(2);
          pics[0].name.should.equal('Author Pic 1');
          pics[1].name.should.equal('Author Pic 2');
          done();
        });
      });
    });

    it('should check if polymorphic relation exists - author', function(done) {
      Author.findById(author.id, function(err, author) {
        author.pictures.exists(7, function(err, exists) {
          exists.should.be.false;
          done();
        });
      });
    });

    it('should create polymorphic item through relation scope', function(done) {
      Picture.findById(anotherPicture.id, function(err, p) {
        p.authors.create({ name: 'Author 3' }, function(err, a) {
          should.not.exist(err);
          author = a;
          author.name.should.equal('Author 3');
          done();
        });
      });
    });

    it('should create polymorphic through model - new author', function(done) {
      PictureLink.findOne({ where: {
        pictureId: anotherPicture.id, imageableId: author.id, imageableType: 'Author',
      }}, function(err, link) {
        should.not.exist(err);
        link.pictureId.should.eql(anotherPicture.id);
        link.imageableId.should.eql(author.id);
        link.imageableType.should.equal('Author');
        done();
      });
    });

    it('should find polymorphic items - new author', function(done) {
      Author.findById(author.id, function(err, author) {
        author.pictures(function(err, pics) {
          pics.should.have.length(1);
          pics[0].id.should.eql(anotherPicture.id);
          pics[0].name.should.equal('Example');
          done();
        });
      });
    });
  });

  describe('belongsTo', function() {
    var List, Item, Fear, Mind;

    var listId, itemId;

    it('can be declared in different ways', function() {
      List = db.define('List', { name: String });
      Item = db.define('Item', { name: String });
      Fear = db.define('Fear');
      Mind = db.define('Mind');

      // syntax 1 (old)
      Item.belongsTo(List);
      Object.keys((new Item).toObject()).should.containEql('listId');
      (new Item).list.should.be.an.instanceOf(Function);

      // syntax 2 (new)
      Fear.belongsTo('mind', {
        methods: { check: function() { return true; } },
      });

      Object.keys((new Fear).toObject()).should.containEql('mindId');
      (new Fear).mind.should.be.an.instanceOf(Function);
      // (new Fear).mind.build().should.be.an.instanceOf(Mind);
    });

    it('should setup a custom method on accessor', function() {
      var rel = Fear.relations['mind'];
      rel.defineMethod('other', function() {
        return true;
      });
    });

    it('should have setup a custom method on accessor', function() {
      var f = new Fear();
      f.mind.check.should.be.a.function;
      f.mind.check().should.be.true;
      f.mind.other.should.be.a.function;
      f.mind.other().should.be.true;
    });

    it('can be used to query data', function(done) {
      List.hasMany('todos', { model: Item });
      db.automigrate(['List', 'Item', 'Fear', 'Mind'], function() {
        List.create({ name: 'List 1' }, function(e, list) {
          listId = list.id;
          should.not.exist(e);
          should.exist(list);
          list.todos.create({ name: 'Item 1' }, function(err, todo) {
            itemId = todo.id;
            todo.list(function(e, l) {
              should.not.exist(e);
              should.exist(l);
              l.should.be.an.instanceOf(List);
              todo.list().id.should.equal(l.id);
              todo.list().name.should.equal('List 1');
              done();
            });
          });
        });
      });
    });

    it('can be used to query data with getAsync with callback', function(done) {
      List.hasMany('todos', { model: Item });
      db.automigrate(['List', 'Item', 'Fear', 'Find'], function() {
        List.create({ name: 'List 1' }, function(e, list) {
          listId = list.id;
          should.not.exist(e);
          should.exist(list);
          list.todos.create({ name: 'Item 1' }, function(err, todo) {
            itemId = todo.id;
            todo.list.getAsync(function(e, l) {
              should.not.exist(e);
              should.exist(l);
              l.should.be.an.instanceOf(List);
              todo.list().id.should.equal(l.id);
              todo.list().name.should.equal('List 1');
              done();
            });
          });
        });
      });
    });

    it('can be used to query data with promises', function(done) {
      List.hasMany('todos', { model: Item });
      db.automigrate(['List', 'Item', 'Fear', 'Find'], function() {
        List.create({ name: 'List 1' })
        .then(function(list) {
          listId = list.id;
          should.exist(list);
          return list.todos.create({ name: 'Item 1' });
        })
        .then(function(todo) {
          itemId = todo.id;
          return todo.list.getAsync()
          .then(function(l) {
            should.exist(l);
            l.should.be.an.instanceOf(List);
            todo.list().id.should.equal(l.id);
            todo.list().name.should.equal('List 1');
            done();
          });
        })
        .catch(done);
      });
    });

    it('could accept objects when creating on scope', function(done) {
      List.create(function(e, list) {
        should.not.exist(e);
        should.exist(list);
        Item.create({ list: list }, function(err, item) {
          should.not.exist(err);
          should.exist(item);
          should.exist(item.listId);
          item.listId.should.equal(list.id);
          item.__cachedRelations.list.should.equal(list);
          done();
        });
      });
    });

    it('should update related item on scope', function(done) {
      Item.findById(itemId, function(e, todo) {
        todo.list.update({ name: 'List A' }, function(err, list) {
          should.not.exist(err);
          should.exist(list);
          list.name.should.equal('List A');
          done();
        });
      });
    });

    it('should get related item on scope', function(done) {
      Item.findById(itemId, function(e, todo) {
        todo.list(function(err, list) {
          should.not.exist(err);
          should.exist(list);
          list.name.should.equal('List A');
          done();
        });
      });
    });

    it('should destroy related item on scope', function(done) {
      Item.findById(itemId, function(e, todo) {
        todo.list.destroy(function(err) {
          should.not.exist(err);
          done();
        });
      });
    });

    it('should get related item on scope - verify', function(done) {
      Item.findById(itemId, function(e, todo) {
        todo.list(function(err, list) {
          should.not.exist(err);
          should.not.exist(list);
          done();
        });
      });
    });

    it('should not have deleted related item', function(done) {
      List.findById(listId, function(e, list) {
        should.not.exist(e);
        should.exist(list);
        done();
      });
    });

    it('should allow to create belongsTo model in beforeCreate hook', function(done) {
      var mind;
      Fear.beforeCreate = function(next) {
        this.mind.create(function(err, m) {
          mind = m;
          if (err) next(err); else next();
        });
      };
      Fear.create(function(err, fear) {
        should.not.exists(err);
        should.exists(fear);
        fear.mindId.should.be.equal(mind.id);
        should.exists(fear.mind());
        done();
      });
    });

    it('should allow to create belongsTo model in beforeCreate hook with promises', function(done) {
      var mind;
      Fear.beforeCreate = function(next) {
        this.mind.create()
        .then(function(m) {
          mind = m;
          next();
        }).catch(next);
      };
      Fear.create()
      .then(function(fear) {
        should.exists(fear);
        fear.mindId.should.be.equal(mind.id);
        should.exists(fear.mind());
        done();
      }).catch(done);
    });
  });

  describe('belongsTo with scope', function() {
    var Person, Passport;

    it('can be declared with scope and properties', function(done) {
      Person = db.define('Person', { name: String, age: Number, passportNotes: String });
      Passport = db.define('Passport', { name: String, notes: String });
      Passport.belongsTo(Person, {
        properties: { notes: 'passportNotes' },
        scope: { fields: { id: true, name: true }},
      });
      db.automigrate(['Person', 'Passport'], done);
    });

    var personCreated;
    it('should create record on scope', function(done) {
      var p = new Passport({ name: 'Passport', notes: 'Some notes...' });
      p.person.create({ name: 'Fred', age: 36 }, function(err, person) {
        personCreated = person;
        p.personId.should.equal(person.id);
        person.name.should.equal('Fred');
        person.passportNotes.should.equal('Some notes...');
        p.save(function(err, passport) {
          should.not.exists(err);
          done();
        });
      });
    });

    it('should find record on scope', function(done) {
      Passport.findOne(function(err, p) {
        p.personId.should.eql(personCreated.id);
        p.person(function(err, person) {
          person.name.should.equal('Fred');
          person.should.have.property('age', undefined);
          person.should.have.property('passportNotes', undefined);
          done();
        });
      });
    });

    it('should create record on scope with promises', function(done) {
      var p = new Passport({ name: 'Passport', notes: 'Some notes...' });
      p.person.create({ name: 'Fred', age: 36 })
      .then(function(person) {
        p.personId.should.equal(person.id);
        person.name.should.equal('Fred');
        person.passportNotes.should.equal('Some notes...');
        return p.save();
      })
      .then(function(passport) {
        done();
      })
      .catch(done);
    });

    it('should find record on scope with promises', function(done) {
      Passport.findOne()
      .then(function(p) {
        p.personId.should.eql(personCreated.id);
        return p.person.getAsync();
      })
      .then(function(person) {
        person.name.should.equal('Fred');
        person.should.have.property('age', undefined);
        person.should.have.property('passportNotes', undefined);
        done();
      })
      .catch(done);
    });
  });

  // Disable the tests until the issue in
  // https://github.com/strongloop/loopback-datasource-juggler/pull/399
  // is fixed
  describe.skip('belongsTo with embed', function() {
    var Person, Passport;

    it('can be declared with embed and properties', function(done) {
      Person = db.define('Person', { name: String, age: Number });
      Passport = db.define('Passport', { name: String, notes: String });
      Passport.belongsTo(Person, {
        properties: ['name'],
        options: { embedsProperties: true, invertProperties: true },
      });
      db.automigrate(['Person', 'Passport'], done);
    });

    it('should create record with embedded data', function(done) {
      Person.create({ name: 'Fred', age: 36 }, function(err, person) {
        var p = new Passport({ name: 'Passport', notes: 'Some notes...' });
        p.person(person);
        p.personId.should.equal(person.id);
        var data = p.toObject(true);
        data.person.id.should.equal(person.id);
        data.person.name.should.equal('Fred');
        p.save(function(err) {
          should.not.exists(err);
          done();
        });
      });
    });

    it('should find record with embedded data', function(done) {
      Passport.findOne(function(err, p) {
        should.not.exists(err);
        var data = p.toObject(true);
        data.person.id.should.equal(p.personId);
        data.person.name.should.equal('Fred');
        done();
      });
    });

    it('should find record with embedded data with promises', function(done) {
      Passport.findOne()
      .then(function(p) {
        var data = p.toObject(true);
        data.person.id.should.equal(p.personId);
        data.person.name.should.equal('Fred');
        done();
      }).catch(done);
    });
  });

  describe('hasOne', function() {
    var Supplier, Account;
    var supplierId, accountId;

    before(function() {
      // db = getSchema();
      Supplier = db.define('Supplier', { name: String });
      Account = db.define('Account', { accountNo: String, supplierName: String });
    });

    it('can be declared using hasOne method', function() {
      Supplier.hasOne(Account, {
        properties: { name: 'supplierName' },
        methods: { check: function() { return true; } },
      });
      Object.keys((new Account()).toObject()).should.containEql('supplierId');
      (new Supplier()).account.should.be.an.instanceOf(Function);
    });

    it('should setup a custom method on accessor', function() {
      var rel = Supplier.relations['account'];
      rel.defineMethod('other', function() {
        return true;
      });
    });

    it('should have setup a custom method on accessor', function() {
      var s = new Supplier();
      s.account.check.should.be.a.function;
      s.account.check().should.be.true;
      s.account.other.should.be.a.function;
      s.account.other().should.be.true;
    });

    it('can be used to query data', function(done) {
      db.automigrate(['Supplier', 'Account'], function() {
        Supplier.create({ name: 'Supplier 1' }, function(e, supplier) {
          supplierId = supplier.id;
          should.not.exist(e);
          should.exist(supplier);
          supplier.account.create({ accountNo: 'a01' }, function(err, account) {
            supplier.account(function(e, act) {
              accountId = act.id;
              should.not.exist(e);
              should.exist(act);
              act.should.be.an.instanceOf(Account);
              supplier.account().id.should.equal(act.id);
              act.supplierName.should.equal(supplier.name);
              done();
            });
          });
        });
      });
    });

    it('can be used to query data with getAsync with callback', function(done) {
      db.automigrate(['Supplier', 'Account'], function() {
        Supplier.create({ name: 'Supplier 1' }, function(e, supplier) {
          supplierId = supplier.id;
          should.not.exist(e);
          should.exist(supplier);
          supplier.account.create({ accountNo: 'a01' }, function(err, account) {
            supplier.account.getAsync(function(e, act) {
              accountId = act.id;
              should.not.exist(e);
              should.exist(act);
              act.should.be.an.instanceOf(Account);
              supplier.account().id.should.equal(act.id);
              act.supplierName.should.equal(supplier.name);
              done();
            });
          });
        });
      });
    });

    it('can be used to query data with promises', function(done) {
      db.automigrate(['Supplier', 'Account'], function() {
        Supplier.create({ name: 'Supplier 1' })
        .then(function(supplier) {
          supplierId = supplier.id;
          should.exist(supplier);
          return supplier.account.create({ accountNo: 'a01' })
          .then(function(account) {
            return supplier.account.getAsync();
          })
          .then(function(act) {
            accountId = act.id;
            should.exist(act);
            act.should.be.an.instanceOf(Account);
            supplier.account().id.should.equal(act.id);
            act.supplierName.should.equal(supplier.name);
            done();
          });
        })
        .catch(done);
      });
    });

    it('should set targetClass on scope property', function() {
      should.equal(Supplier.prototype.account._targetClass, 'Account');
    });

    it('should update the related item on scope', function(done) {
      Supplier.findById(supplierId, function(e, supplier) {
        should.not.exist(e);
        should.exist(supplier);
        supplier.account.update({ supplierName: 'Supplier A' }, function(err, act) {
          should.not.exist(e);
          act.supplierName.should.equal('Supplier A');
          done();
        });
      });
    });

    it('should update the related item on scope with promises', function(done) {
      Supplier.findById(supplierId)
      .then(function(supplier) {
        should.exist(supplier);
        return supplier.account.update({ supplierName: 'Supplier B' });
      })
      .then(function(act) {
        act.supplierName.should.equal('Supplier B');
        done();
      })
      .catch(done);
    });

    it('should ignore the foreign key in the update', function(done) {
      Supplier.create({ name: 'Supplier 2' }, function(e, supplier) {
        var sid = supplier.id;
        Supplier.findById(supplierId, function(e, supplier) {
          should.not.exist(e);
          should.exist(supplier);
          supplier.account.update({ supplierName: 'Supplier A',
              supplierId: sid },
            function(err, act) {
              should.not.exist(e);
              act.supplierName.should.equal('Supplier A');
              act.supplierId.should.eql(supplierId);
              done();
            });
        });
      });
    });

    it('should get the related item on scope', function(done) {
      Supplier.findById(supplierId, function(e, supplier) {
        should.not.exist(e);
        should.exist(supplier);
        supplier.account(function(err, act) {
          should.not.exist(e);
          should.exist(act);
          act.supplierName.should.equal('Supplier A');
          done();
        });
      });
    });

    it('should get the related item on scope with promises', function(done) {
      Supplier.findById(supplierId)
      .then(function(supplier) {
        should.exist(supplier);
        return supplier.account.getAsync();
      })
      .then(function(act) {
        should.exist(act);
        act.supplierName.should.equal('Supplier A');
        done();
      })
      .catch(done);
    });

    it('should destroy the related item on scope', function(done) {
      Supplier.findById(supplierId, function(e, supplier) {
        should.not.exist(e);
        should.exist(supplier);
        supplier.account.destroy(function(err) {
          should.not.exist(e);
          done();
        });
      });
    });

    it('should destroy the related item on scope with promises', function(done) {
      Supplier.findById(supplierId)
      .then(function(supplier) {
        should.exist(supplier);
        return supplier.account.create({ accountNo: 'a01' })
        .then(function(account) {
          return supplier.account.destroy();
        })
        .then(function(err) {
          done();
        });
      })
      .catch(done);
    });

    it('should get the related item on scope - verify', function(done) {
      Supplier.findById(supplierId, function(e, supplier) {
        should.not.exist(e);
        should.exist(supplier);
        supplier.account(function(err, act) {
          should.not.exist(e);
          should.not.exist(act);
          done();
        });
      });
    });

    it('should get the related item on scope with promises - verify', function(done) {
      Supplier.findById(supplierId)
      .then(function(supplier) {
        should.exist(supplier);
        return supplier.account.getAsync();
      })
      .then(function(act) {
        should.not.exist(act);
        done();
      })
      .catch(done);
    });

    it('should have deleted related item', function(done) {
      Supplier.findById(supplierId, function(e, supplier) {
        should.not.exist(e);
        should.exist(supplier);
        done();
      });
    });
  });

  describe('hasOne with scope', function() {
    var Supplier, Account;
    var supplierId, accountId;

    before(function() {
      // db = getSchema();
      Supplier = db.define('Supplier', { name: String });
      Account = db.define('Account', { accountNo: String, supplierName: String, block: Boolean });
      Supplier.hasOne(Account, { scope: { where: { block: false }}, properties: { name: 'supplierName' }});
    });

    it('can be used to query data', function(done) {
      db.automigrate(['Supplier', 'Account'], function() {
        Supplier.create({ name: 'Supplier 1' }, function(e, supplier) {
          supplierId = supplier.id;
          should.not.exist(e);
          should.exist(supplier);
          supplier.account.create({ accountNo: 'a01', block: false }, function(err, account) {
            supplier.account(function(e, act) {
              accountId = act.id;
              should.not.exist(e);
              should.exist(act);
              act.should.be.an.instanceOf(Account);
              should.exist(act.block);
              act.block.should.be.false;
              supplier.account().id.should.equal(act.id);
              act.supplierName.should.equal(supplier.name);
              done();
            });
          });
        });
      });
    });

    it('should include record that matches scope', function(done) {
      Supplier.findById(supplierId, { include: 'account' }, function(err, supplier) {
        should.exists(supplier.toJSON().account);
        supplier.account(function(err, account) {
          should.exists(account);
          done();
        });
      });
    });

    it('should not find record that does not match scope', function(done) {
      Account.updateAll({ block: true }, function(err) {
        Supplier.findById(supplierId, function(err, supplier) {
          supplier.account(function(err, account) {
            should.not.exists(account);
            done();
          });
        });
      });
    });

    it('should not include record that does not match scope', function(done) {
      Account.updateAll({ block: true }, function(err) {
        Supplier.findById(supplierId, { include: 'account' }, function(err, supplier) {
          should.not.exists(supplier.toJSON().account);
          supplier.account(function(err, account) {
            should.not.exists(account);
            done();
          });
        });
      });
    });

    it('can be used to query data with promises', function(done) {
      db.automigrate(['Supplier', 'Account'], function() {
        Supplier.create({ name: 'Supplier 1' })
        .then(function(supplier) {
          supplierId = supplier.id;
          should.exist(supplier);
          return supplier.account.create({ accountNo: 'a01', block: false })
          .then(function(account) {
            return supplier.account.getAsync();
          })
          .then(function(act) {
            accountId = act.id;
            should.exist(act);
            act.should.be.an.instanceOf(Account);
            should.exist(act.block);
            act.block.should.be.false;
            supplier.account().id.should.equal(act.id);
            act.supplierName.should.equal(supplier.name);
            done();
          });
        })
        .catch(done);
      });
    });

    it('should find record that match scope with promises', function(done) {
      Account.updateAll({ block: true })
      .then(function() {
        return Supplier.findById(supplierId);
      })
      .then(function(supplier) {
        return supplier.account.getAsync();
      })
      .then(function(account) {
        should.not.exist(account);
        done();
      })
      .catch(done);
    });
  });

  describe('hasOne with non standard id', function() {
    var Supplier, Account;
    var supplierId, accountId;

    before(function() {
      // db = getSchema();
      Supplier = db.define('Supplier', {
        sid: {
          type: String,
          id: true,
          generated: true,
        },
        name: String,
      });
      Account = db.define('Account', {
        accid: {
          type: String,
          id: true,
          generated: false,
        },
        supplierName: String,
      });
    });

    it('can be declared with non standard foreignKey', function() {
      Supplier.hasOne(Account, {
        properties: { name: 'supplierName' },
        foreignKey: 'sid',
      });
      Object.keys((new Account()).toObject()).should.containEql('sid');
      (new Supplier()).account.should.be.an.instanceOf(Function);
    });

    it('can be used to query data', function(done) {
      db.automigrate(['Supplier', 'Account'], function() {
        Supplier.create({ name: 'Supplier 1' }, function(e, supplier) {
          supplierId = supplier.sid;
          should.not.exist(e);
          should.exist(supplier);
          supplier.account.create({ accid: 'a01' }, function(err, account) {
            supplier.account(function(e, act) {
              accountId = act.accid;
              should.not.exist(e);
              should.exist(act);
              act.should.be.an.instanceOf(Account);
              supplier.account().accid.should.equal(act.accid);
              act.supplierName.should.equal(supplier.name);
              done();
            });
          });
        });
      });
    });

    it('should destroy the related item on scope', function(done) {
      Supplier.findById(supplierId, function(e, supplier) {
        should.not.exist(e);
        should.exist(supplier);
        supplier.account.destroy(function(err) {
          should.not.exist(e);
          done();
        });
      });
    });

    it('should get the related item on scope - verify', function(done) {
      Supplier.findById(supplierId, function(e, supplier) {
        should.not.exist(e);
        should.exist(supplier);
        supplier.account(function(err, act) {
          should.not.exist(e);
          should.not.exist(act);
          done();
        });
      });
    });

    it('should have deleted related item', function(done) {
      Supplier.findById(supplierId, function(e, supplier) {
        should.not.exist(e);
        should.exist(supplier);
        done();
      });
    });
  });

  describe('hasOne with primaryKey different from model PK', function() {
    var CompanyBoard, Boss;
    var companyBoardId, bossId;

    before(function() {
      db = getSchema();
      CompanyBoard = db.define('CompanyBoard', {
        membersNumber: Number,
        companyId: String,
      });
      Boss = db.define('Boss', {
        id: { type: String, id: true, generated: false },
        boardMembersNumber: Number,
        companyId: String,
      });
    });

    it('relation can be declared with primaryKey', function() {
      CompanyBoard.hasOne(Boss, {
        properties: { membersNumber: 'boardMembersNumber' },
        primaryKey: 'companyId',
        foreignKey: 'companyId',
      });
      Object.keys((new Boss()).toObject()).should.containEql('companyId');
      (new CompanyBoard()).boss.should.be.an.instanceOf(Function);
    });

    it('can be used to query data', function(done) {
      db.automigrate(['CompanyBoard', 'Boss'], function() {
        CompanyBoard.create({ membersNumber: 7, companyId: 'Company1' }, function(e, companyBoard) {
          companyBoardId = companyBoard.id;
          should.not.exist(e);
          should.exist(companyBoard);
          companyBoard.boss.create({ id: 'a01' }, function(err, account) {
            companyBoard.boss(function(e, boss) {
              bossId = boss.id;
              should.not.exist(e);
              should.exist(boss);
              boss.should.be.an.instanceOf(Boss);
              companyBoard.boss().id.should.eql(boss.id);
              boss.boardMembersNumber.should.eql(companyBoard.membersNumber);
              boss.companyId.should.eql(companyBoard.companyId);
              done();
            });
          });
        });
      });
    });

    it('should destroy the related item on scope', function(done) {
      CompanyBoard.findById(companyBoardId, function(e, companyBoard) {
        should.not.exist(e);
        should.exist(companyBoard);
        companyBoard.boss.destroy(function(err) {
          should.not.exist(e);
          done();
        });
      });
    });

    it('should get the related item on scope - verify', function(done) {
      CompanyBoard.findById(companyBoardId, function(e, companyBoard) {
        should.not.exist(e);
        should.exist(companyBoard);
        companyBoard.boss(function(err, act) {
          should.not.exist(e);
          should.not.exist(act);
          done();
        });
      });
    });
  });

  describe('hasMany with primaryKey different from model PK', function() {
    var Employee, Boss;
    var COMPANY_ID = 'Company1';

    before(function() {
      db = getSchema();
      Employee = db.define('Employee', { name: String, companyId: String });
      Boss = db.define('Boss', { address: String, companyId: String });
    });

    it('relation can be declared with primaryKey', function() {
      Boss.hasMany(Employee, {
        primaryKey: 'companyId',
        foreignKey: 'companyId',
      });
      (new Boss()).employees.should.be.an.instanceOf(Function);
    });

    it('can be used to query employees for boss', function() {
      return db.automigrate(['Employee', 'Boss']).then(function() {
        return Boss.create({ address: 'testAddress', companyId: COMPANY_ID })
          .then(function(boss) {
            should.exist(boss);
            should.exist(boss.employees);
            return boss.employees.create([{ name: 'a01' }, { name: 'a02' }])
              .then(function(employees) {
                should.exists(employees);
                return boss.employees();
              }).then(function(employees) {
                var employee = employees[0];
                should.exist(employee);
                employees.length.should.equal(2);
                employee.should.be.an.instanceOf(Employee);
                employee.companyId.should.be.eql(boss.companyId);
                return employees;
              });
          });
      });
    });

    it('can be used to query employees for boss2', function() {
      return db.automigrate(['Employee', 'Boss']).then(function() {
        return Boss.create({ address: 'testAddress', companyId: COMPANY_ID })
          .then(function(boss) {
            return Employee.create({ name: 'a01', companyId: COMPANY_ID })
              .then(function(employee) {
                should.exist(employee);
                return boss.employees.getAsync();
              }).then(function(employees) {
                should.exists(employees);
                employees.length.should.equal(1);
              });
          });
      });
    });
  });

  describe('belongsTo with primaryKey different from model PK', function() {
    var Employee, Boss;
    var COMPANY_ID = 'Company1';
    var bossId;

    before(function() {
      db = getSchema();
      Employee = db.define('Employee', { name: String, companyId: String });
      Boss = db.define('Boss', { address: String, companyId: String });
    });

    it('relation can be declared with primaryKey', function() {
      Employee.belongsTo(Boss, {
        primaryKey: 'companyId',
        foreignKey: 'companyId',
      });
      (new Employee()).boss.should.be.an.instanceOf(Function);
    });

    it('can be used to query data', function() {
      return db.automigrate(['Employee', 'Boss']).then(function() {
        return Boss.create({ address: 'testAddress', companyId: COMPANY_ID })
          .then(function(boss) {
            bossId = boss.id;
            return Employee.create({ name: 'a', companyId: COMPANY_ID });
          })
          .then(function(employee) {
            should.exists(employee);
            return employee.boss.getAsync();
          })
          .then(function(boss) {
            should.exists(boss);
            boss.id.should.eql(bossId);
          });
      });
    });
  });

  describe('hasAndBelongsToMany', function() {
    var Article, TagName, ArticleTag;
    it('can be declared', function(done) {
      Article = db.define('Article', { title: String });
      TagName = db.define('TagName', { name: String, flag: String });
      Article.hasAndBelongsToMany('tagNames');
      ArticleTag = db.models.ArticleTagName;
      db.automigrate(['Article', 'TagName', 'ArticleTagName'], done);
    });

    it('should allow to create instances on scope', function(done) {
      Article.create(function(e, article) {
        article.tagNames.create({ name: 'popular' }, function(e, t) {
          t.should.be.an.instanceOf(TagName);
          ArticleTag.findOne(function(e, at) {
            should.exist(at);
            at.tagNameId.toString().should.equal(t.id.toString());
            at.articleId.toString().should.equal(article.id.toString());
            done();
          });
        });
      });
    });

    it('should allow to fetch scoped instances', function(done) {
      Article.findOne(function(e, article) {
        article.tagNames(function(e, tags) {
          should.not.exist(e);
          should.exist(tags);

          article.tagNames().should.eql(tags);

          done();
        });
      });
    });

    it('should allow to add connection with instance', function(done) {
      Article.findOne(function(e, article) {
        TagName.create({ name: 'awesome' }, function(e, tag) {
          article.tagNames.add(tag, function(e, at) {
            should.not.exist(e);
            should.exist(at);
            at.should.be.an.instanceOf(ArticleTag);
            at.tagNameId.should.eql(tag.id);
            at.articleId.should.eql(article.id);
            done();
          });
        });
      });
    });

    it('should allow to remove connection with instance', function(done) {
      Article.findOne(function(e, article) {
        article.tagNames(function(e, tags) {
          var len = tags.length;
          tags.should.not.be.empty;
          article.tagNames.remove(tags[0], function(e) {
            should.not.exist(e);
            article.tagNames(true, function(e, tags) {
              tags.should.have.lengthOf(len - 1);
              done();
            });
          });
        });
      });
    });

    it('should allow to create instances on scope with promises', function(done) {
      db.automigrate(['Article', 'TagName', 'ArticleTagName'], function() {
        Article.create()
        .then(function(article) {
          return article.tagNames.create({ name: 'popular' })
          .then(function(t) {
            t.should.be.an.instanceOf(TagName);
            return ArticleTag.findOne()
            .then(function(at) {
              should.exist(at);
              at.tagNameId.toString().should.equal(t.id.toString());
              at.articleId.toString().should.equal(article.id.toString());
              done();
            });
          });
        }).catch(done);
      });
    });

    it('should allow to fetch scoped instances with promises', function(done) {
      Article.findOne()
      .then(function(article) {
        return article.tagNames.getAsync()
        .then(function(tags) {
          should.exist(tags);
          article.tagNames().should.eql(tags);
          done();
        });
      }).catch(done);
    });

    it('should allow to add connection with instance with promises', function(done) {
      Article.findOne()
      .then(function(article) {
        return TagName.create({ name: 'awesome' })
        .then(function(tag) {
          return article.tagNames.add(tag)
          .then(function(at) {
            should.exist(at);
            at.should.be.an.instanceOf(ArticleTag);
            at.tagNameId.should.eql(tag.id);
            at.articleId.should.eql(article.id);
            done();
          });
        });
      })
      .catch(done);
    });

    it('should allow to remove connection with instance with promises', function(done) {
      Article.findOne()
      .then(function(article) {
        return article.tagNames.getAsync()
        .then(function(tags) {
          var len = tags.length;
          tags.should.not.be.empty;
          return article.tagNames.remove(tags[0])
          .then(function() {
            return article.tagNames.getAsync();
          })
          .then(function(tags) {
            tags.should.have.lengthOf(len - 1);
            done();
          });
        });
      })
      .catch(done);
    });

    it('should set targetClass on scope property', function() {
      should.equal(Article.prototype.tagNames._targetClass, 'TagName');
    });

    it('should apply inclusion fields to the target model', function(done) {
      Article.create({ title: 'a1' }, function(e, article) {
        should.not.exist(e);
        article.tagNames.create({ name: 't1', flag: '1' }, function(e, t) {
          should.not.exist(e);
          Article.find({
            where: { id: article.id },
            include: { relation: 'tagNames', scope: { fields: ['name'] }}},
            function(e, articles) {
              should.not.exist(e);
              articles.should.have.property('length', 1);
              var a = articles[0].toJSON();
              a.should.have.property('title', 'a1');
              a.should.have.property('tagNames');
              a.tagNames.should.have.property('length', 1);
              var n = a.tagNames[0];
              n.should.have.property('name', 't1');
              n.should.have.property('flag', undefined);
              n.id.should.eql(t.id);
              done();
            });
        });
      });
    });

    it('should apply inclusion where to the target model', function(done) {
      Article.create({ title: 'a2' }, function(e, article) {
        should.not.exist(e);
        article.tagNames.create({ name: 't2', flag: '2' }, function(e, t2) {
          should.not.exist(e);
          article.tagNames.create({ name: 't3', flag: '3' }, function(e, t3) {
            Article.find({
              where: { id: article.id },
              include: { relation: 'tagNames', scope: { where: { flag: '2' }}}},
              function(e, articles) {
                should.not.exist(e);
                articles.should.have.property('length', 1);
                var a = articles[0].toJSON();
                a.should.have.property('title', 'a2');
                a.should.have.property('tagNames');
                a.tagNames.should.have.property('length', 1);
                var n = a.tagNames[0];
                n.should.have.property('name', 't2');
                n.should.have.property('flag', '2');
                n.id.should.eql(t2.id);
                done();
              });
          });
        });
      });
    });
  });

  describe('embedsOne', function() {
    var person;
    var Passport;
    var Other;

    before(function() {
      tmp = getTransientDataSource();
      // db = getSchema();
      Person = db.define('Person', { name: String });
      Passport = tmp.define('Passport',
        { name: { type: 'string', required: true }},
        { idInjection: false }
      );
      Address = tmp.define('Address', { street: String }, { idInjection: false });
      Other = db.define('Other', { name: String });
    });

    it('can be declared using embedsOne method', function(done) {
      Person.embedsOne(Passport, {
        default: { name: 'Anonymous' }, // a bit contrived
        methods: { check: function() { return true; } },
      });
      Person.embedsOne(Address); // all by default
      db.automigrate(['Person'], done);
    });

    it('should have setup a property and accessor', function() {
      var p = new Person();
      p.passport.should.be.an.object; // because of default
      p.passportItem.should.be.a.function;
      p.passportItem.create.should.be.a.function;
      p.passportItem.build.should.be.a.function;
      p.passportItem.destroy.should.be.a.function;
    });

    it('should setup a custom method on accessor', function() {
      var rel = Person.relations['passportItem'];
      rel.defineMethod('other', function() {
        return true;
      });
    });

    it('should have setup a custom method on accessor', function() {
      var p = new Person();
      p.passportItem.check.should.be.a.function;
      p.passportItem.check().should.be.true;
      p.passportItem.other.should.be.a.function;
      p.passportItem.other().should.be.true;
    });

    it('should behave properly without default or being set', function(done) {
      var p = new Person();
      should.not.exist(p.address);
      var a = p.addressItem();
      should.not.exist(a);
      Person.create({}, function(err, p) {
        should.not.exist(p.address);
        var a = p.addressItem();
        should.not.exist(a);
        done();
      });
    });

    it('should return an instance with default values', function() {
      var p = new Person();
      p.passport.toObject().should.eql({ name: 'Anonymous' });
      p.passportItem().should.equal(p.passport);
      p.passportItem(function(err, passport) {
        should.not.exist(err);
        passport.should.equal(p.passport);
      });
    });

    it('should embed a model instance', function() {
      var p = new Person();
      p.passportItem(new Passport({ name: 'Fred' }));
      p.passport.toObject().should.eql({ name: 'Fred' });
      p.passport.should.be.an.instanceOf(Passport);
    });

    it('should not embed an invalid model type', function() {
      var p = new Person();
      p.passportItem(new Other());
      p.passport.toObject().should.eql({ name: 'Anonymous' });
      p.passport.should.be.an.instanceOf(Passport);
    });

    var personId;
    it('should create an embedded item on scope', function(done) {
      Person.create({ name: 'Fred' }, function(err, p) {
        should.not.exist(err);
        personId = p.id;
        p.passportItem.create({ name: 'Fredric' }, function(err, passport) {
          should.not.exist(err);
          p.passport.toObject().should.eql({ name: 'Fredric' });
          p.passport.should.be.an.instanceOf(Passport);
          done();
        });
      });
    });

    it('should get an embedded item on scope', function(done) {
      Person.findById(personId, function(err, p) {
        should.not.exist(err);
        var passport = p.passportItem();
        passport.toObject().should.eql({ name: 'Fredric' });
        passport.should.be.an.instanceOf(Passport);
        passport.should.equal(p.passport);
        passport.should.equal(p.passportItem.value());
        done();
      });
    });

    it('should validate an embedded item on scope - on creation', function(done) {
      var p = new Person({ name: 'Fred' });
      p.passportItem.create({}, function(err, passport) {
        should.exist(err);
        err.name.should.equal('ValidationError');
        err.details.messages.name.should.eql(['can\'t be blank']);
        done();
      });
    });

    it('should validate an embedded item on scope - on update', function(done) {
      Person.findById(personId, function(err, p) {
        var passport = p.passportItem();
        passport.name = null;
        p.save(function(err) {
          should.exist(err);
          err.name.should.equal('ValidationError');
          err.details.messages.passportItem
            .should.eql(['is invalid: `name` can\'t be blank']);
          done();
        });
      });
    });

    it('should update an embedded item on scope', function(done) {
      Person.findById(personId, function(err, p) {
        p.passportItem.update({ name: 'Freddy' }, function(err, passport) {
          should.not.exist(err);
          var passport = p.passportItem();
          passport.toObject().should.eql({ name: 'Freddy' });
          passport.should.be.an.instanceOf(Passport);
          passport.should.equal(p.passport);
          done();
        });
      });
    });

    it('should get an embedded item on scope - verify', function(done) {
      Person.findById(personId, function(err, p) {
        should.not.exist(err);
        var passport = p.passportItem();
        passport.toObject().should.eql({ name: 'Freddy' });
        done();
      });
    });

    it('should destroy an embedded item on scope', function(done) {
      Person.findById(personId, function(err, p) {
        p.passportItem.destroy(function(err) {
          should.not.exist(err);
          should.equal(p.passport, null);
          done();
        });
      });
    });

    it('should get an embedded item on scope - verify', function(done) {
      Person.findById(personId, function(err, p) {
        should.not.exist(err);
        should.equal(p.passport, null);
        done();
      });
    });

    it('should save an unsaved model', function(done) {
      var p = new Person({ name: 'Fred' });
      p.isNewRecord().should.be.true;
      p.passportItem.create({ name: 'Fredric' }, function(err, passport) {
        should.not.exist(err);
        p.passport.should.equal(passport);
        p.isNewRecord().should.be.false;
        done();
      });
    });

    it('should create an embedded item on scope with promises', function(done) {
      Person.create({ name: 'Fred' })
      .then(function(p) {
        personId = p.id;
        p.passportItem.create({ name: 'Fredric' })
        .then(function(passport) {
          p.passport.toObject().should.eql({ name: 'Fredric' });
          p.passport.should.be.an.instanceOf(Passport);
          done();
        });
      }).catch(done);
    });

    it('should get an embedded item on scope with promises', function(done) {
      Person.findById(personId)
      .then(function(p) {
        var passport = p.passportItem();
        passport.toObject().should.eql({ name: 'Fredric' });
        passport.should.be.an.instanceOf(Passport);
        passport.should.equal(p.passport);
        passport.should.equal(p.passportItem.value());
        done();
      }).catch(done);
    });

    it('should validate an embedded item on scope with promises - on creation', function(done) {
      var p = new Person({ name: 'Fred' });
      p.passportItem.create({})
      .then(function(passport) {
        should.not.exist(passport);
        done();
      })
      .catch(function(err) {
        should.exist(err);
        err.name.should.equal('ValidationError');
        err.details.messages.name.should.eql(['can\'t be blank']);
        done();
      }).catch(done);
    });

    it('should validate an embedded item on scope with promises - on update', function(done) {
      Person.findById(personId)
      .then(function(p) {
        var passport = p.passportItem();
        passport.name = null;
        return p.save()
        .then(function(p) {
          should.not.exist(p);
          done();
        })
        .catch(function(err) {
          should.exist(err);
          err.name.should.equal('ValidationError');
          err.details.messages.passportItem
            .should.eql(['is invalid: `name` can\'t be blank']);
          done();
        });
      }).catch(done);
    });

    it('should update an embedded item on scope with promises', function(done) {
      Person.findById(personId)
      .then(function(p) {
        return p.passportItem.update({ name: 'Jason' })
        .then(function(passport) {
          var passport = p.passportItem();
          passport.toObject().should.eql({ name: 'Jason' });
          passport.should.be.an.instanceOf(Passport);
          passport.should.equal(p.passport);
          done();
        });
      }).catch(done);
    });

    it('should get an embedded item on scope with promises - verify', function(done) {
      Person.findById(personId)
      .then(function(p) {
        var passport = p.passportItem();
        passport.toObject().should.eql({ name: 'Jason' });
        done();
      }).catch(done);
    });

    it('should destroy an embedded item on scope with promises', function(done) {
      Person.findById(personId)
      .then(function(p) {
        return p.passportItem.destroy()
        .then(function() {
          should.equal(p.passport, null);
          done();
        });
      }).catch(done);
    });

    it('should get an embedded item on scope with promises - verify', function(done) {
      Person.findById(personId)
      .then(function(p) {
        should.equal(p.passport, null);
        done();
      }).catch(done);
    });
  });

  describe('embedsOne - persisted model', function() {
    // This test spefically uses the Memory connector
    // in order to test the use of the auto-generated
    // id, in the sequence of the related model.

    before(function() {
      db = getMemoryDataSource();
      Person = db.define('Person', { name: String });
      Passport = db.define('Passport',
        { name: { type: 'string', required: true }}
      );
    });

    it('can be declared using embedsOne method', function(done) {
      Person.embedsOne(Passport, {
        options: { persistent: true },
      });
      db.automigrate(['Person', 'Passport'], done);
    });

    it('should create an item - to offset id', function(done) {
      Passport.create({ name: 'Wilma' }, function(err, p) {
        should.not.exist(err);
        p.id.should.equal(1);
        p.name.should.equal('Wilma');
        done();
      });
    });

    it('should create an embedded item on scope', function(done) {
      Person.create({ name: 'Fred' }, function(err, p) {
        should.not.exist(err);
        p.passportItem.create({ name: 'Fredric' }, function(err, passport) {
          should.not.exist(err);
          p.passport.id.should.eql(2);
          p.passport.name.should.equal('Fredric');
          done();
        });
      });
    });

    it('should create an embedded item on scope with promises', function(done) {
      Person.create({ name: 'Barney' })
      .then(function(p) {
        return p.passportItem.create({ name: 'Barnabus' })
        .then(function(passport) {
          p.passport.id.should.eql(3);
          p.passport.name.should.equal('Barnabus');
          done();
        });
      }).catch(done);
    });
  });

  describe('embedsOne - generated id', function() {
    before(function() {
      tmp = getTransientDataSource();
      // db = getSchema();
      Person = db.define('Person', { name: String });
      Passport = tmp.define('Passport',
        { id: { type: 'string', id: true, generated: true }},
        { name: { type: 'string', required: true }}
      );
    });

    it('can be declared using embedsOne method', function(done) {
      Person.embedsOne(Passport);
      db.automigrate(['Person'], done);
    });

    it('should create an embedded item on scope', function(done) {
      Person.create({ name: 'Fred' }, function(err, p) {
        should.not.exist(err);
        p.passportItem.create({ name: 'Fredric' }, function(err, passport) {
          should.not.exist(err);
          passport.id.should.match(/^[0-9a-fA-F]{24}$/);
          p.passport.name.should.equal('Fredric');
          done();
        });
      });
    });
  });

  describe('embedsMany', function() {
    var address1, address2;

    before(function(done) {
      tmp = getTransientDataSource({ defaultIdType: Number });
      // db = getSchema();
      Person = db.define('Person', { name: String });
      Address = tmp.define('Address', { street: String });
      Address.validatesPresenceOf('street');

      db.automigrate(['Person'], done);
    });

    it('can be declared', function(done) {
      Person.embedsMany(Address);
      db.automigrate(['Person'], done);
    });

    it('should have setup embedded accessor/scope', function() {
      var p = new Person({ name: 'Fred' });
      p.addresses.should.be.an.array;
      p.addresses.should.have.length(0);
      p.addressList.should.be.a.function;
      p.addressList.findById.should.be.a.function;
      p.addressList.updateById.should.be.a.function;
      p.addressList.destroy.should.be.a.function;
      p.addressList.exists.should.be.a.function;
      p.addressList.create.should.be.a.function;
      p.addressList.build.should.be.a.function;
    });

    it('should create embedded items on scope', function(done) {
      Person.create({ name: 'Fred' }, function(err, p) {
        p.addressList.create({ street: 'Street 1' }, function(err, address) {
          should.not.exist(err);
          address1 = address;
          should.exist(address1.id);
          address1.street.should.equal('Street 1');
          done();
        });
      });
    });

    it('should create embedded items on scope', function(done) {
      Person.findOne(function(err, p) {
        p.addressList.create({ street: 'Street 2' }, function(err, address) {
          should.not.exist(err);
          address2 = address;
          should.exist(address2.id);
          address2.street.should.equal('Street 2');
          done();
        });
      });
    });

    it('should return embedded items from scope', function(done) {
      Person.findOne(function(err, p) {
        p.addressList(function(err, addresses) {
          should.not.exist(err);

          var list = p.addressList();
          list.should.equal(addresses);
          list.should.equal(p.addresses);

          p.addressList.value().should.equal(list);

          addresses.should.have.length(2);
          addresses[0].id.should.eql(address1.id);
          addresses[0].street.should.equal('Street 1');
          addresses[1].id.should.eql(address2.id);
          addresses[1].street.should.equal('Street 2');
          done();
        });
      });
    });

    it('should filter embedded items on scope', function(done) {
      Person.findOne(function(err, p) {
        p.addressList({ where: { street: 'Street 2' }}, function(err, addresses) {
          should.not.exist(err);
          addresses.should.have.length(1);
          addresses[0].id.should.eql(address2.id);
          addresses[0].street.should.equal('Street 2');
          done();
        });
      });
    });

    it('should validate embedded items', function(done) {
      Person.findOne(function(err, p) {
        p.addressList.create({}, function(err, address) {
          should.exist(err);
          should.not.exist(address);
          err.name.should.equal('ValidationError');
          err.details.codes.street.should.eql(['presence']);
          done();
        });
      });
    });

    it('should find embedded items by id', function(done) {
      Person.findOne(function(err, p) {
        p.addressList.findById(address2.id, function(err, address) {
          address.should.be.instanceof(Address);
          address.id.should.eql(address2.id);
          address.street.should.equal('Street 2');
          done();
        });
      });
    });

    it('should check if item exists', function(done) {
      Person.findOne(function(err, p) {
        p.addressList.exists(address2.id, function(err, exists) {
          should.not.exist(err);
          exists.should.be.true;
          done();
        });
      });
    });

    it('should update embedded items by id', function(done) {
      Person.findOne(function(err, p) {
        p.addressList.updateById(address2.id, { street: 'New Street' }, function(err, address) {
          address.should.be.instanceof(Address);
          address.id.should.eql(address2.id);
          address.street.should.equal('New Street');
          done();
        });
      });
    });

    it('should validate the update of embedded items', function(done) {
      Person.findOne(function(err, p) {
        p.addressList.updateById(address2.id, { street: null }, function(err, address) {
          err.name.should.equal('ValidationError');
          err.details.codes.street.should.eql(['presence']);
          done();
        });
      });
    });

    it('should find embedded items by id - verify', function(done) {
      Person.findOne(function(err, p) {
        p.addressList.findById(address2.id, function(err, address) {
          address.should.be.instanceof(Address);
          address.id.should.eql(address2.id);
          address.street.should.equal('New Street');
          done();
        });
      });
    });

    it('should have accessors: at, get, set', function(done) {
      Person.findOne(function(err, p) {
        p.addressList.at(0).id.should.equal(address1.id);
        p.addressList.get(address1.id).id.should.equal(address1.id);
        p.addressList.set(address1.id, { street: 'Changed 1' });
        p.addresses[0].street.should.equal('Changed 1');
        p.addressList.at(1).id.should.equal(address2.id);
        p.addressList.get(address2.id).id.should.equal(address2.id);
        p.addressList.set(address2.id, { street: 'Changed 2' });
        p.addresses[1].street.should.equal('Changed 2');
        done();
      });
    });

    it('should remove embedded items by id', function(done) {
      Person.findOne(function(err, p) {
        p.addresses.should.have.length(2);
        p.addressList.destroy(address1.id, function(err) {
          should.not.exist(err);
          p.addresses.should.have.length(1);
          done();
        });
      });
    });

    it('should have removed embedded items - verify', function(done) {
      Person.findOne(function(err, p) {
        p.addresses.should.have.length(1);
        done();
      });
    });

    it('should create embedded items on scope', function(done) {
      Person.findOne(function(err, p) {
        p.addressList.create({ street: 'Street 3' }, function(err, address) {
          should.not.exist(err);
          address.street.should.equal('Street 3');
          done();
        });
      });
    });

    it('should remove embedded items - filtered', function(done) {
      Person.findOne(function(err, p) {
        p.addresses.should.have.length(2);
        p.addressList.destroyAll({ street: 'Street 3' }, function(err) {
          should.not.exist(err);
          p.addresses.should.have.length(1);
          done();
        });
      });
    });

    it('should remove all embedded items', function(done) {
      Person.findOne(function(err, p) {
        p.addresses.should.have.length(1);
        p.addressList.destroyAll(function(err) {
          should.not.exist(err);
          p.addresses.should.have.length(0);
          done();
        });
      });
    });

    it('should have removed all embedded items - verify', function(done) {
      Person.findOne(function(err, p) {
        p.addresses.should.have.length(0);
        done();
      });
    });

    it('should save an unsaved model', function(done) {
      var p = new Person({ name: 'Fred' });
      p.isNewRecord().should.be.true;
      p.addressList.create({ street: 'Street 4' }, function(err, address) {
        should.not.exist(err);
        address.street.should.equal('Street 4');
        p.isNewRecord().should.be.false;
        done();
      });
    });
  });

  describe('embedsMany - numeric ids + forceId', function() {
    before(function(done) {
      tmp = getTransientDataSource();
      // db = getSchema();
      Person = db.define('Person', { name: String });
      Address = tmp.define('Address', {
        id: { type: Number, id: true },
        street: String,
      });
      db.automigrate(['Person'], done);
    });

    it('can be declared', function(done) {
      Person.embedsMany(Address, { options: { forceId: true }});
      db.automigrate(['Person'], done);
    });

    it('should create embedded items on scope', function(done) {
      Person.create({ name: 'Fred' }, function(err, p) {
        p.addressList.create({ street: 'Street 1' }, function(err, address) {
          should.not.exist(err);
          address.id.should.equal(1);
          p.addressList.create({ street: 'Street 2' }, function(err, address) {
            address.id.should.equal(2);
            p.addressList.create({ id: 12345, street: 'Street 3' }, function(err, address) {
              address.id.should.equal(3);
              done();
            });
          });
        });
      });
    });
  });

  describe('embedsMany - explicit ids', function() {
    before(function(done) {
      tmp = getTransientDataSource();
      // db = getSchema();
      Person = db.define('Person', { name: String });
      Address = tmp.define('Address', { street: String });
      Address.validatesPresenceOf('street');

      db.automigrate(['Person'], done);
    });

    it('can be declared', function(done) {
      Person.embedsMany(Address);
      db.automigrate(['Person'], done);
    });

    it('should create embedded items on scope', function(done) {
      Person.create({ name: 'Fred' }, function(err, p) {
        p.addressList.create({ id: 'home', street: 'Street 1' }, function(err, address) {
          should.not.exist(err);
          p.addressList.create({ id: 'work', street: 'Work Street 2' }, function(err, address) {
            should.not.exist(err);
            address.id.should.equal('work');
            address.street.should.equal('Work Street 2');
            done();
          });
        });
      });
    });

    it('should find embedded items by id', function(done) {
      Person.findOne(function(err, p) {
        p.addressList.findById('work', function(err, address) {
          address.should.be.instanceof(Address);
          address.id.should.equal('work');
          address.street.should.equal('Work Street 2');
          done();
        });
      });
    });

    it('should check for duplicate ids', function(done) {
      Person.findOne(function(err, p) {
        p.addressList.create({ id: 'home', street: 'Invalid' }, function(err, addresses) {
          should.exist(err);
          err.name.should.equal('ValidationError');
          err.details.codes.addresses.should.eql(['uniqueness']);
          done();
        });
      });
    });

    it('should update embedded items by id', function(done) {
      Person.findOne(function(err, p) {
        p.addressList.updateById('home', { street: 'New Street' }, function(err, address) {
          address.should.be.instanceof(Address);
          address.id.should.equal('home');
          address.street.should.equal('New Street');
          done();
        });
      });
    });

    it('should remove embedded items by id', function(done) {
      Person.findOne(function(err, p) {
        p.addresses.should.have.length(2);
        p.addressList.destroy('home', function(err) {
          should.not.exist(err);
          p.addresses.should.have.length(1);
          done();
        });
      });
    });

    it('should have embedded items - verify', function(done) {
      Person.findOne(function(err, p) {
        p.addresses.should.have.length(1);
        done();
      });
    });

    it('should validate all embedded items', function(done) {
      var addresses = [];
      addresses.push({ id: 'home', street: 'Home Street' });
      addresses.push({ id: 'work', street: '' });
      Person.create({ name: 'Wilma', addresses: addresses }, function(err, p) {
        err.name.should.equal('ValidationError');
        err.details.messages.addresses.should.eql([
          'contains invalid item: `work` (`street` can\'t be blank)',
        ]);
        done();
      });
    });

    it('should build embedded items', function(done) {
      Person.create({ name: 'Wilma' }, function(err, p) {
        p.addressList.build({ id: 'home', street: 'Home' });
        p.addressList.build({ id: 'work', street: 'Work' });
        p.addresses.should.have.length(2);
        p.save(function(err, p) {
          done();
        });
      });
    });

    it('should have embedded items - verify', function(done) {
      Person.findOne({ where: { name: 'Wilma' }}, function(err, p) {
        p.name.should.equal('Wilma');
        p.addresses.should.have.length(2);
        p.addresses[0].id.should.equal('home');
        p.addresses[0].street.should.equal('Home');
        p.addresses[1].id.should.equal('work');
        p.addresses[1].street.should.equal('Work');
        done();
      });
    });

    it('should have accessors: at, get, set', function(done) {
      Person.findOne({ where: { name: 'Wilma' }}, function(err, p) {
        p.name.should.equal('Wilma');
        p.addresses.should.have.length(2);
        p.addressList.at(0).id.should.equal('home');
        p.addressList.get('home').id.should.equal('home');
        p.addressList.set('home', { id: 'den' }).id.should.equal('den');
        p.addressList.at(1).id.should.equal('work');
        p.addressList.get('work').id.should.equal('work');
        p.addressList.set('work', { id: 'factory' }).id.should.equal('factory');
        done();
      });
    });

    it('should create embedded from attributes - property name', function(done) {
      var addresses = [
        { id: 'home', street: 'Home Street' },
        { id: 'work', street: 'Work Street' },
      ];
      Person.create({ name: 'Wilma', addresses: addresses }, function(err, p) {
        should.not.exist(err);
        p.addressList.at(0).id.should.equal('home');
        p.addressList.at(1).id.should.equal('work');
        done();
      });
    });

    it('should not create embedded from attributes - relation name', function(done) {
      var addresses = [
        { id: 'home', street: 'Home Street' },
        { id: 'work', street: 'Work Street' },
      ];
      Person.create({ name: 'Wilma', addressList: addresses }, function(err, p) {
        should.not.exist(err);
        p.addresses.should.have.length(0);
        done();
      });
    });

    it('should create embedded items with auto-generated id', function(done) {
      Person.create({ name: 'Wilma' }, function(err, p) {
        p.addressList.create({ street: 'Home Street 1' }, function(err, address) {
          should.not.exist(err);
          address.id.should.match(/^[0-9a-fA-F]{24}$/);
          address.street.should.equal('Home Street 1');
          done();
        });
      });
    });
  });

  describe('embedsMany - persisted model', function() {
    var address0, address1, address2;
    var person;

    // This test spefically uses the Memory connector
    // in order to test the use of the auto-generated
    // id, in the sequence of the related model.

    before(function(done) {
      db = getMemoryDataSource();
      Person = db.define('Person', { name: String });
      Address = db.define('Address', { street: String });
      Address.validatesPresenceOf('street');

      db.automigrate(['Person', 'Address'], done);
    });

    it('can be declared', function(done) {
      // to save related model itself, set
      // persistent: true
      Person.embedsMany(Address, {
        scope: { order: 'street' },
        options: { persistent: true },
      });
      db.automigrate(['Person', 'Address'], done);
    });

    it('should create individual items (0)', function(done) {
      Address.create({ street: 'Street 0' }, function(err, inst) {
        inst.id.should.equal(1); // offset sequence
        address0 = inst;
        done();
      });
    });

    it('should create individual items (1)', function(done) {
      Address.create({ street: 'Street 1' }, function(err, inst) {
        inst.id.should.equal(2);
        address1 = inst;
        done();
      });
    });

    it('should create individual items (2)', function(done) {
      Address.create({ street: 'Street 2' }, function(err, inst) {
        inst.id.should.equal(3);
        address2 = inst;
        done();
      });
    });

    it('should create individual items (3)', function(done) {
      Address.create({ street: 'Street 3' }, function(err, inst) {
        inst.id.should.equal(4); // offset sequence
        done();
      });
    });

    it('should add embedded items on scope', function(done) {
      Person.create({ name: 'Fred' }, function(err, p) {
        person = p;
        p.addressList.create(address1.toObject(), function(err, address) {
          should.not.exist(err);
          address.id.should.eql(2);
          address.street.should.equal('Street 1');
          p.addressList.create(address2.toObject(), function(err, address) {
            should.not.exist(err);
            address.id.should.eql(3);
            address.street.should.equal('Street 2');
            done();
          });
        });
      });
    });

    it('should create embedded items on scope', function(done) {
      Person.findById(person.id, function(err, p) {
        p.addressList.create({ street: 'Street 4' }, function(err, address) {
          should.not.exist(err);
          address.id.should.equal(5); // in Address sequence, correct offset
          address.street.should.equal('Street 4');
          done();
        });
      });
    });

    it('should have embedded items on scope', function(done) {
      Person.findById(person.id, function(err, p) {
        p.addressList(function(err, addresses) {
          should.not.exist(err);
          addresses.should.have.length(3);
          addresses[0].street.should.equal('Street 1');
          addresses[1].street.should.equal('Street 2');
          addresses[2].street.should.equal('Street 4');
          done();
        });
      });
    });

    it('should validate embedded items on scope - id', function(done) {
      Person.create({ name: 'Wilma' }, function(err, p) {
        p.addressList.create({ id: null, street: 'Street 1' }, function(err, address) {
          should.not.exist(err);
          address.street.should.equal('Street 1');
          done();
        });
      });
    });

    it('should validate embedded items on scope - street', function(done) {
      Person.create({ name: 'Wilma' }, function(err, p) {
        p.addressList.create({ id: 1234 }, function(err, address) {
          should.exist(err);
          err.name.should.equal('ValidationError');
          err.details.codes.street.should.eql(['presence']);
          var expected = 'The `Address` instance is not valid. ';
          expected += 'Details: `street` can\'t be blank (value: undefined).';
          err.message.should.equal(expected);
          done();
        });
      });
    });
  });

  describe('embedsMany - relations, scope and properties', function() {
    var category, job1, job2, job3;

    before(function() {
      // db = getSchema();
      Category = db.define('Category', { name: String });
      Job = db.define('Job', { name: String });
      Link = db.define('Link', { name: String, notes: String });
    });

    it('can be declared', function(done) {
      Category.embedsMany(Link, {
        as: 'items', // rename
        scope: { include: 'job' }, // always include
        options: { belongsTo: 'job' }, // optional, for add()/remove()
      });
      Link.belongsTo(Job, {
        foreignKey: 'id', // re-use the actual job id
        properties: { id: 'id', name: 'name' }, // denormalize, transfer id
        options: { invertProperties: true },
      });
      db.automigrate(['Category', 'Job', 'Link'], function() {
        Job.create({ name: 'Job 0' }, done); // offset ids for tests
      });
    });

    it('should setup related items', function(done) {
      Job.create({ name: 'Job 1' }, function(err, p) {
        job1 = p;
        Job.create({ name: 'Job 2' }, function(err, p) {
          job2 = p;
          Job.create({ name: 'Job 3' }, function(err, p) {
            job3 = p;
            done();
          });
        });
      });
    });

    it('should associate items on scope', function(done) {
      Category.create({ name: 'Category A' }, function(err, cat) {
        var link = cat.items.build();
        link.job(job1);
        var link = cat.items.build();
        link.job(job2);
        cat.save(function(err, cat) {
          var job = cat.items.at(0);
          job.should.be.instanceof(Link);
          job.should.not.have.property('jobId');
          job.id.should.eql(job1.id);
          job.name.should.equal(job1.name);
          var job = cat.items.at(1);
          job.id.should.eql(job2.id);
          job.name.should.equal(job2.name);
          done();
        });
      });
    });

    it('should include related items on scope', function(done) {
      Category.findOne(function(err, cat) {
        cat.links.should.have.length(2);

        // denormalized properties:
        cat.items.at(0).should.be.instanceof(Link);
        cat.items.at(0).id.should.eql(job1.id);
        cat.items.at(0).name.should.equal(job1.name);
        cat.items.at(1).id.should.eql(job2.id);
        cat.items.at(1).name.should.equal(job2.name);

        // lazy-loaded relations
        should.not.exist(cat.items.at(0).job());
        should.not.exist(cat.items.at(1).job());

        cat.items(function(err, items) {
          cat.items.at(0).job().should.be.instanceof(Job);
          cat.items.at(1).job().should.be.instanceof(Job);
          cat.items.at(1).job().name.should.equal('Job 2');
          done();
        });
      });
    });

    it('should remove embedded items by id', function(done) {
      Category.findOne(function(err, cat) {
        cat.links.should.have.length(2);
        cat.items.destroy(job1.id, function(err) {
          should.not.exist(err);
          cat.links.should.have.length(1);
          done();
        });
      });
    });

    it('should find items on scope', function(done) {
      Category.findOne(function(err, cat) {
        cat.links.should.have.length(1);
        cat.items.at(0).id.should.eql(job2.id);
        cat.items.at(0).name.should.equal(job2.name);

        // lazy-loaded relations
        should.not.exist(cat.items.at(0).job());

        cat.items(function(err, items) {
          cat.items.at(0).job().should.be.instanceof(Job);
          cat.items.at(0).job().name.should.equal('Job 2');
          done();
        });
      });
    });

    it('should add related items to scope', function(done) {
      Category.findOne(function(err, cat) {
        cat.links.should.have.length(1);
        cat.items.add(job3, function(err, link) {
          link.should.be.instanceof(Link);
          link.id.should.eql(job3.id);
          link.name.should.equal('Job 3');

          cat.links.should.have.length(2);
          done();
        });
      });
    });

    it('should find items on scope', function(done) {
      Category.findOne(function(err, cat) {
        cat.links.should.have.length(2);

        cat.items.at(0).should.be.instanceof(Link);
        cat.items.at(0).id.should.eql(job2.id);
        cat.items.at(0).name.should.equal(job2.name);
        cat.items.at(1).id.should.eql(job3.id);
        cat.items.at(1).name.should.equal(job3.name);

        done();
      });
    });

    it('should remove embedded items by reference id', function(done) {
      Category.findOne(function(err, cat) {
        cat.links.should.have.length(2);
        cat.items.remove(job2.id, function(err) {
          should.not.exist(err);
          cat.links.should.have.length(1);
          done();
        });
      });
    });

    it('should have removed embedded items by reference id', function(done) {
      Category.findOne(function(err, cat) {
        cat.links.should.have.length(1);
        done();
      });
    });

    var jobId;

    it('should create items on scope', function(done) {
      Category.create({ name: 'Category B' }, function(err, cat) {
        category = cat;
        var link = cat.items.build({ notes: 'Some notes...' });
        link.job.create({ name: 'Job 1' }, function(err, p) {
          jobId = p.id;
          cat.links[0].id.should.eql(p.id);
          cat.links[0].name.should.equal('Job 1'); // denormalized
          cat.links[0].notes.should.equal('Some notes...');
          cat.items.at(0).should.equal(cat.links[0]);
          done();
        });
      });
    });

    it('should find items on scope', function(done) {
      Category.findById(category.id, function(err, cat) {
        cat.name.should.equal('Category B');
        cat.links.toObject().should.eql([
          { id: jobId, name: 'Job 1', notes: 'Some notes...' },
        ]);
        cat.items.at(0).should.equal(cat.links[0]);
        cat.items(function(err, items) { // alternative access
          items.should.be.an.array;
          items.should.have.length(1);
          items[0].job(function(err, p) {
            p.name.should.equal('Job 1'); // actual value
            done();
          });
        });
      });
    });

    it('should update items on scope - and save parent', function(done) {
      Category.findById(category.id, function(err, cat) {
        var link = cat.items.at(0);
        link.updateAttributes({ notes: 'Updated notes...' }, function(err, link) {
          link.notes.should.equal('Updated notes...');
          done();
        });
      });
    });

    it('should find items on scope - verify update', function(done) {
      Category.findById(category.id, function(err, cat) {
        cat.name.should.equal('Category B');
        cat.links.toObject().should.eql([
          { id: jobId, name: 'Job 1', notes: 'Updated notes...' },
        ]);
        done();
      });
    });

    it('should remove items from scope - and save parent', function(done) {
      Category.findById(category.id, function(err, cat) {
        cat.items.at(0).destroy(function(err, link) {
          cat.links.should.eql([]);
          done();
        });
      });
    });

    it('should find items on scope - verify destroy', function(done) {
      Category.findById(category.id, function(err, cat) {
        cat.name.should.equal('Category B');
        cat.links.should.eql([]);
        done();
      });
    });
  });

  describe('embedsMany - polymorphic relations', function() {
    var person1, person2;

    before(function(done) {
      // db = getSchema();
      tmp = getTransientDataSource();

      Book = db.define('Book', { name: String });
      Author = db.define('Author', { name: String });
      Reader = db.define('Reader', { name: String });

      Link = tmp.define('Link', {
        id: { type: Number, id: true },
        name: String, notes: String,
      }); // generic model
      Link.validatesPresenceOf('linkedId');
      Link.validatesPresenceOf('linkedType');

      db.automigrate(['Book', 'Author', 'Reader'], done);
    });

    it('can be declared', function(done) {
      var idType = db.connector.getDefaultIdType();

      Book.embedsMany(Link, { as: 'people',
        polymorphic: 'linked',
        scope: { include: 'linked' },
      });
      Link.belongsTo('linked', {
        polymorphic: { idType: idType },  // native type
        properties: { name: 'name' },     // denormalized
        options: { invertProperties: true },
      });
      db.automigrate(['Book', 'Author', 'Reader'], done);
    });

    it('should setup related items', function(done) {
      Author.create({ name: 'Author 1' }, function(err, p) {
        person1 = p;
        Reader.create({ name: 'Reader 1' }, function(err, p) {
          person2 = p;
          done();
        });
      });
    });

    it('should create items on scope', function(done) {
      Book.create({ name: 'Book' }, function(err, book) {
        var link = book.people.build({ notes: 'Something ...' });
        link.linked(person1);
        var link = book.people.build();
        link.linked(person2);
        book.save(function(err, book) {
          should.not.exist(err);

          var link = book.people.at(0);
          link.should.be.instanceof(Link);
          link.id.should.equal(1);
          link.linkedId.should.eql(person1.id);
          link.linkedType.should.equal('Author');
          link.name.should.equal('Author 1');

          var link = book.people.at(1);
          link.should.be.instanceof(Link);
          link.id.should.equal(2);
          link.linkedId.should.eql(person2.id);
          link.linkedType.should.equal('Reader');
          link.name.should.equal('Reader 1');

          done();
        });
      });
    });

    it('should include related items on scope', function(done) {
      Book.findOne(function(err, book) {
        book.links.should.have.length(2);

        var link = book.people.at(0);
        link.should.be.instanceof(Link);
        link.id.should.equal(1);
        link.linkedId.should.eql(person1.id);
        link.linkedType.should.equal('Author');
        link.notes.should.equal('Something ...');

        var link = book.people.at(1);
        link.should.be.instanceof(Link);
        link.id.should.equal(2);
        link.linkedId.should.eql(person2.id);
        link.linkedType.should.equal('Reader');

        // lazy-loaded relations
        should.not.exist(book.people.at(0).linked());
        should.not.exist(book.people.at(1).linked());

        book.people(function(err, people) {
          people[0].linked().should.be.instanceof(Author);
          people[0].linked().name.should.equal('Author 1');
          people[1].linked().should.be.instanceof(Reader);
          people[1].linked().name.should.equal('Reader 1');
          done();
        });
      });
    });

    it('should include nested related items on scope', function(done) {
      // There's some date duplication going on, so it might
      // make sense to override toObject on a case-by-case basis
      // to sort this out (delete links, keep people).
      // In loopback, an afterRemote filter could do this as well.

      Book.find({ include: 'people' }, function(err, books) {
        var obj = books[0].toObject();

        obj.should.have.property('links');
        obj.should.have.property('people');

        obj.links.should.have.length(2);
        obj.links[0].name.should.equal('Author 1');
        obj.links[1].name.should.equal('Reader 1');

        obj.people.should.have.length(2);

        obj.people[0].name.should.equal('Author 1');
        obj.people[0].notes.should.equal('Something ...');

        obj.people[0].linked.name.should.equal('Author 1');
        obj.people[1].linked.name.should.equal('Reader 1');

        done();
      });
    });
  });

  describe('referencesMany', function() {
    var job1, job2, job3;

    before(function(done) {
      // db = getSchema();
      Category = db.define('Category', { name: String });
      Job = db.define('Job', { name: String });

      db.automigrate(['Job', 'Category'], done);
    });

    it('can be declared', function(done) {
      var reverse = function(cb) {
        cb = cb || createPromiseCallback();
        var modelInstance = this.modelInstance;
        var fk = this.definition.keyFrom;
        var ids = modelInstance[fk] || [];
        modelInstance.updateAttribute(fk, ids.reverse(), function(err, inst) {
          cb(err, inst[fk] || []);
        });
        return cb.promise;
      };

      reverse.shared = true; // remoting
      reverse.http = { verb: 'put', path: '/jobs/reverse' };

      Category.referencesMany(Job, { scopeMethods: {
        reverse: reverse,
      }});

      Category.prototype['__reverse__jobs'].should.be.a.function;
      should.exist(Category.prototype['__reverse__jobs'].shared);
      Category.prototype['__reverse__jobs'].http.should.eql(reverse.http);

      db.automigrate(['Job', 'Category'], done);
    });

    it('should setup test records', function(done) {
      Job.create({ name: 'Job 1' }, function(err, p) {
        job1 = p;
        Job.create({ name: 'Job 3' }, function(err, p) {
          job3 = p;
          done();
        });
      });
    });

    it('should create record on scope', function(done) {
      Category.create({ name: 'Category A' }, function(err, cat) {
        cat.jobIds.should.be.an.array;
        cat.jobIds.should.have.length(0);
        cat.jobs.create({ name: 'Job 2' }, function(err, p) {
          should.not.exist(err);
          cat.jobIds.should.have.length(1);
          cat.jobIds.should.eql([p.id]);
          p.name.should.equal('Job 2');
          job2 = p;
          done();
        });
      });
    });

    it('should not allow duplicate record on scope', function(done) {
      Category.findOne(function(err, cat) {
        cat.jobIds = [job2.id, job2.id];
        cat.save(function(err, p) {
          should.exist(err);
          err.name.should.equal('ValidationError');
          err.details.codes.jobs.should.eql(['uniqueness']);
          done();
        });
      });
    });

    it('should find items on scope', function(done) {
      Category.findOne(function(err, cat) {
        cat.jobIds.should.eql([job2.id]);
        cat.jobs(function(err, jobs) {
          should.not.exist(err);
          var p = jobs[0];
          p.id.should.eql(job2.id);
          p.name.should.equal('Job 2');
          done();
        });
      });
    });

    it('should find items on scope - findById', function(done) {
      Category.findOne(function(err, cat) {
        cat.jobIds.should.eql([job2.id]);
        cat.jobs.findById(job2.id, function(err, p) {
          should.not.exist(err);
          p.should.be.instanceof(Job);
          p.id.should.eql(job2.id);
          p.name.should.equal('Job 2');
          done();
        });
      });
    });

    it('should check if a record exists on scope', function(done) {
      Category.findOne(function(err, cat) {
        cat.jobs.exists(job2.id, function(err, exists) {
          should.not.exist(err);
          should.exist(exists);
          done();
        });
      });
    });

    it('should update a record on scope', function(done) {
      Category.findOne(function(err, cat) {
        var attrs = { name: 'Job 2 - edit' };
        cat.jobs.updateById(job2.id, attrs, function(err, p) {
          should.not.exist(err);
          p.name.should.equal(attrs.name);
          done();
        });
      });
    });

    it('should get a record by index - at', function(done) {
      Category.findOne(function(err, cat) {
        cat.jobs.at(0, function(err, p) {
          should.not.exist(err);
          p.should.be.instanceof(Job);
          p.id.should.eql(job2.id);
          p.name.should.equal('Job 2 - edit');
          done();
        });
      });
    });

    it('should add a record to scope - object', function(done) {
      Category.findOne(function(err, cat) {
        cat.jobs.add(job1, function(err, prod) {
          should.not.exist(err);
          cat.jobIds.should.eql([job2.id, job1.id]);
          prod.id.should.eql(job1.id);
          prod.should.have.property('name');
          done();
        });
      });
    });

    it('should add a record to scope - object', function(done) {
      Category.findOne(function(err, cat) {
        cat.jobs.add(job3.id, function(err, prod) {
          should.not.exist(err);
          var expected = [job2.id, job1.id, job3.id];
          cat.jobIds.should.eql(expected);
          prod.id.should.eql(job3.id);
          prod.should.have.property('name');
          done();
        });
      });
    });

    it('should find items on scope - findById', function(done) {
      Category.findOne(function(err, cat) {
        cat.jobs.findById(job3.id, function(err, p) {
          should.not.exist(err);
          p.id.should.eql(job3.id);
          p.name.should.equal('Job 3');
          done();
        });
      });
    });

    it('should find items on scope - filter', function(done) {
      Category.findOne(function(err, cat) {
        var filter = { where: { name: 'Job 1' }};
        cat.jobs(filter, function(err, jobs) {
          should.not.exist(err);
          jobs.should.have.length(1);
          var p = jobs[0];
          p.id.should.eql(job1.id);
          p.name.should.equal('Job 1');
          done();
        });
      });
    });

    it('should remove items from scope', function(done) {
      Category.findOne(function(err, cat) {
        cat.jobs.remove(job1.id, function(err, ids) {
          should.not.exist(err);
          var expected = [job2.id, job3.id];
          cat.jobIds.should.eql(expected);
          ids.should.eql(cat.jobIds);
          done();
        });
      });
    });

    it('should find items on scope - verify', function(done) {
      Category.findOne(function(err, cat) {
        var expected = [job2.id, job3.id];
        cat.jobIds.should.eql(expected);
        cat.jobs(function(err, jobs) {
          should.not.exist(err);
          jobs.should.have.length(2);
          jobs[0].id.should.eql(job2.id);
          jobs[1].id.should.eql(job3.id);
          done();
        });
      });
    });

    it('should find items on scope and ordered them by name DESC', function(done) {
      Category.find(function(err, categories) {
        categories.should.have.length(1);
        categories[0].jobs({ order: 'name DESC' }, function(err, jobs) {
          should.not.exist(err);
          jobs.should.have.length(2);
          jobs[0].id.should.eql(job3.id);
          jobs[1].id.should.eql(job2.id);
          done();
        });
      });
    });

    it('should allow custom scope methods - reverse', function(done) {
      Category.findOne(function(err, cat) {
        cat.jobs.reverse(function(err, ids) {
          var expected = [job3.id, job2.id];
          ids.should.eql(expected);
          cat.jobIds.should.eql(expected);
          done();
        });
      });
    });

    it('should include related items from scope', function(done) {
      Category.find({ include: 'jobs' }, function(err, categories) {
        categories.should.have.length(1);
        var cat = categories[0].toObject();
        cat.name.should.equal('Category A');
        cat.jobs.should.have.length(2);
        cat.jobs[0].id.should.eql(job3.id);
        cat.jobs[1].id.should.eql(job2.id);
        done();
      });
    });

    it('should destroy items from scope - destroyById', function(done) {
      Category.findOne(function(err, cat) {
        cat.jobs.destroy(job2.id, function(err) {
          should.not.exist(err);
          var expected = [job3.id];
          cat.jobIds.should.eql(expected);
          Job.exists(job2.id, function(err, exists) {
            should.not.exist(err);
            should.exist(exists);
            exists.should.be.false;
            done();
          });
        });
      });
    });

    it('should find items on scope - verify', function(done) {
      Category.findOne(function(err, cat) {
        var expected = [job3.id];
        cat.jobIds.should.eql(expected);
        cat.jobs(function(err, jobs) {
          should.not.exist(err);
          jobs.should.have.length(1);
          jobs[0].id.should.eql(job3.id);
          done();
        });
      });
    });

    it('should setup test records with promises', function(done) {
      db.automigrate(['Job', 'Category'], function() {
        return Job.create({ name: 'Job 1' })
        .then(function(p) {
          job1 = p;
          return Job.create({ name: 'Job 3' });
        })
        .then(function(p) {
          job3 = p;
          done();
        }).catch(done);
      });
    });

    it('should create record on scope with promises', function(done) {
      Category.create({ name: 'Category A' })
      .then(function(cat) {
        cat.jobIds.should.be.an.array;
        cat.jobIds.should.have.length(0);
        return cat.jobs.create({ name: 'Job 2' })
        .then(function(p) {
          cat.jobIds.should.have.length(1);
          cat.jobIds.should.eql([p.id]);
          p.name.should.equal('Job 2');
          job2 = p;
          done();
        });
      }).catch(done);
    });

    it('should not allow duplicate record on scope with promises', function(done) {
      Category.findOne()
      .then(function(cat) {
        cat.jobIds = [job2.id, job2.id];
        cat.save();
      })
      .then(function(p) {
        should.not.exist(p);
        done();
      })
      .catch(function(err) {
        should.exist(err);
        err.name.should.equal('ValidationError');
        err.details.codes.jobs.should.eql(['uniqueness']);
        done();
      });
    });

    it('should find items on scope with promises', function(done) {
      Category.findOne()
      .then(function(cat) {
        cat.jobIds.should.eql([job2.id]);
        return cat.jobs.getAsync();
      })
      .then(function(jobs) {
        var p = jobs[0];
        p.id.should.eql(job2.id);
        p.name.should.equal('Job 2');
        done();
      })
      .catch(done);
    });

    it('should find items on scope with promises - findById', function(done) {
      Category.findOne()
      .then(function(cat) {
        cat.jobIds.should.eql([job2.id]);
        return cat.jobs.findById(job2.id);
      })
      .then(function(p) {
        p.should.be.instanceof(Job);
        p.id.should.eql(job2.id);
        p.name.should.equal('Job 2');
        done();
      })
      .catch(done);
    });

    it('should check if a record exists on scope with promises', function(done) {
      Category.findOne()
      .then(function(cat) {
        return cat.jobs.exists(job2.id)
        .then(function(exists) {
          should.exist(exists);
          done();
        });
      }).catch(done);
    });

    it('should update a record on scope with promises', function(done) {
      Category.findOne()
      .then(function(cat) {
        var attrs = { name: 'Job 2 - edit' };
        return cat.jobs.updateById(job2.id, attrs)
        .then(function(p) {
          p.name.should.equal(attrs.name);
          done();
        });
      })
      .catch(done);
    });

    it('should get a record by index with promises - at', function(done) {
      Category.findOne()
      .then(function(cat) {
        return cat.jobs.at(0);
      })
      .then(function(p) {
        p.should.be.instanceof(Job);
        p.id.should.eql(job2.id);
        p.name.should.equal('Job 2 - edit');
        done();
      })
      .catch(done);
    });

    it('should add a record to scope with promises - object', function(done) {
      Category.findOne()
      .then(function(cat) {
        return cat.jobs.add(job1)
        .then(function(prod) {
          cat.jobIds.should.eql([job2.id, job1.id]);
          prod.id.should.eql(job1.id);
          prod.should.have.property('name');
          done();
        });
      })
      .catch(done);
    });

    it('should add a record to scope with promises - object', function(done) {
      Category.findOne()
      .then(function(cat) {
        return cat.jobs.add(job3.id)
        .then(function(prod) {
          var expected = [job2.id, job1.id, job3.id];
          cat.jobIds.should.eql(expected);
          prod.id.should.eql(job3.id);
          prod.should.have.property('name');
          done();
        });
      })
      .catch(done);
    });

    it('should find items on scope with promises - findById', function(done) {
      Category.findOne()
      .then(function(cat) {
        return cat.jobs.findById(job3.id);
      })
      .then(function(p) {
        p.id.should.eql(job3.id);
        p.name.should.equal('Job 3');
        done();
      })
      .catch(done);
    });

    it('should find items on scope with promises - filter', function(done) {
      Category.findOne()
      .then(function(cat) {
        var filter = { where: { name: 'Job 1' }};
        return cat.jobs.getAsync(filter);
      })
      .then(function(jobs) {
        jobs.should.have.length(1);
        var p = jobs[0];
        p.id.should.eql(job1.id);
        p.name.should.equal('Job 1');
        done();
      })
      .catch(done);
    });

    it('should remove items from scope with promises', function(done) {
      Category.findOne()
      .then(function(cat) {
        return cat.jobs.remove(job1.id)
        .then(function(ids) {
          var expected = [job2.id, job3.id];
          cat.jobIds.should.eql(expected);
          ids.should.eql(cat.jobIds);
          done();
        });
      })
      .catch(done);
    });

    it('should find items on scope with promises - verify', function(done) {
      Category.findOne()
      .then(function(cat) {
        var expected = [job2.id, job3.id];
        cat.jobIds.should.eql(expected);
        return cat.jobs.getAsync();
      })
      .then(function(jobs) {
        jobs.should.have.length(2);
        jobs[0].id.should.eql(job2.id);
        jobs[1].id.should.eql(job3.id);
        done();
      })
      .catch(done);
    });

    it('should find items on scope and ordered them by name DESC', function(done) {
      Category.find()
      .then(function(categories) {
        categories.should.have.length(1);
        return categories[0].jobs.getAsync({ order: 'name DESC' });
      })
      .then(function(jobs) {
        jobs.should.have.length(2);
        jobs[0].id.should.eql(job3.id);
        jobs[1].id.should.eql(job2.id);
        done();
      })
      .catch(done);
    });

    it('should allow custom scope methods with promises - reverse', function(done) {
      Category.findOne()
      .then(function(cat) {
        return cat.jobs.reverse()
        .then(function(ids) {
          var expected = [job3.id, job2.id];
          ids.should.eql(expected);
          cat.jobIds.should.eql(expected);
          done();
        });
      })
      .catch(done);
    });

    it('should include related items from scope with promises', function(done) {
      Category.find({ include: 'jobs' })
      .then(function(categories) {
        categories.should.have.length(1);
        var cat = categories[0].toObject();
        cat.name.should.equal('Category A');
        cat.jobs.should.have.length(2);
        cat.jobs[0].id.should.eql(job3.id);
        cat.jobs[1].id.should.eql(job2.id);
        done();
      }).catch(done);
    });

    it('should destroy items from scope with promises - destroyById', function(done) {
      Category.findOne()
      .then(function(cat) {
        return cat.jobs.destroy(job2.id)
        .then(function() {
          var expected = [job3.id];
          cat.jobIds.should.eql(expected);
          return Job.exists(job2.id);
        })
        .then(function(exists) {
          should.exist(exists);
          exists.should.be.false;
          done();
        });
      })
      .catch(done);
    });

    it('should find items on scope with promises - verify', function(done) {
      Category.findOne()
      .then(function(cat) {
        var expected = [job3.id];
        cat.jobIds.should.eql(expected);
        return cat.jobs.getAsync();
      })
      .then(function(jobs) {
        jobs.should.have.length(1);
        jobs[0].id.should.eql(job3.id);
        done();
      })
      .catch(done);
    });
  });

  describe('custom relation/scope methods', function() {
    var categoryId;

    before(function(done) {
      // db = getSchema();
      Category = db.define('Category', { name: String });
      Job = db.define('Job', { name: String });

      db.automigrate(['Job', 'Category'], done);
    });

    it('can be declared', function(done) {
      var relation = Category.hasMany(Job);

      var summarize = function(cb) {
        cb = cb || createPromiseCallback();
        var modelInstance = this.modelInstance;
        this.fetch(function(err, items) {
          if (err) return cb(err, []);
          var summary = items.map(function(item) {
            var obj = item.toObject();
            obj.categoryName = modelInstance.name;
            return obj;
          });
          cb(null, summary);
        });
        return cb.promise;
      };

      summarize.shared = true; // remoting
      summarize.http = { verb: 'get', path: '/jobs/summary' };

      relation.defineMethod('summarize', summarize);

      Category.prototype['__summarize__jobs'].should.be.a.function;
      should.exist(Category.prototype['__summarize__jobs'].shared);
      Category.prototype['__summarize__jobs'].http.should.eql(summarize.http);

      db.automigrate(['Job', 'Category'], done);
    });

    it('should setup test records', function(done) {
      Category.create({ name: 'Category A' }, function(err, cat) {
        categoryId = cat.id;
        cat.jobs.create({ name: 'Job 1' }, function(err, p) {
          cat.jobs.create({ name: 'Job 2' }, function(err, p) {
            done();
          });
        });
      });
    });

    it('should allow custom scope methods - summarize', function(done) {
      var expected = [
        { name: 'Job 1', categoryId: categoryId, categoryName: 'Category A' },
        { name: 'Job 2', categoryId: categoryId, categoryName: 'Category A' },
      ];

      Category.findOne(function(err, cat) {
        cat.jobs.summarize(function(err, summary) {
          should.not.exist(err);
          var result = summary.map(function(item) {
            delete item.id;
            return item;
          });
          result.should.eql(expected);
          done();
        });
      });
    });

    it('should allow custom scope methods with promises - summarize', function(done) {
      var expected = [
        { name: 'Job 1', categoryId: categoryId, categoryName: 'Category A' },
        { name: 'Job 2', categoryId: categoryId, categoryName: 'Category A' },
      ];

      Category.findOne()
      .then(function(cat) {
        return cat.jobs.summarize();
      })
      .then(function(summary) {
        var result = summary.map(function(item) {
          delete item.id;
          return item;
        });
        result.should.eql(expected);
        done();
      })
      .catch(done);
    });
  });
});