loopback-datasource-juggler/test/include.test.js

var db, User, Post, Passport, City, Street, Building, should = require('should');
var nbSchemaRequests = 0;

describe('include', function() {

    before(setup);

    it('should fetch belongsTo relation', function(done) {
        Passport.all({include: 'owner'}, function (err, passports) {
            passports.length.should.be.ok;
            passports.forEach(function(p) {
                p.__cachedRelations.should.have.property('owner');
                var owner = p.__cachedRelations.owner;
                if (!p.ownerId) {
                    should.not.exist(owner);
                } else {
                    should.exist(owner);
                    owner.id.should.equal(p.ownerId);
                }
            });
            done();
        });
    });

    it('should fetch hasMany relation', function(done) {
        User.all({include: 'posts'}, function (err, users) {
            should.not.exist(err);
            should.exist(users);
            users.length.should.be.ok;
            users.forEach(function(u) {
                u.__cachedRelations.should.have.property('posts');
                u.__cachedRelations.posts.forEach(function(p) {
                    p.userId.should.equal(u.id);
                });
            });
            done();
        });
    });

    it('should fetch Passport - Owner - Posts', function(done) {
        Passport.all({include: {owner: 'posts'}}, function(err, passports) {
            should.not.exist(err);
            should.exist(passports);
            passports.length.should.be.ok;
            passports.forEach(function(p) {
                p.__cachedRelations.should.have.property('owner');
                var user = p.__cachedRelations.owner;
                if (!p.ownerId) {
                    should.not.exist(user);
                } else {
                    should.exist(user);
                    user.id.should.equal(p.ownerId);
                    user.__cachedRelations.should.have.property('posts');
                    user.__cachedRelations.posts.forEach(function(pp) {
                        pp.userId.should.equal(user.id);
                    });
                }
            });
            done();
        });
    });

    it('should fetch Passports - User - Posts - User', function(done) {
        Passport.all({
            include: {owner: {posts: 'author'}}
        }, function(err, passports) {
            should.not.exist(err);
            should.exist(passports);
            passports.length.should.be.ok;
            passports.forEach(function(p) {
                p.__cachedRelations.should.have.property('owner');
                var user = p.__cachedRelations.owner;
                if (!p.ownerId) {
                    should.not.exist(user);
                } else {
                    should.exist(user);
                    user.id.should.equal(p.ownerId);
                    user.__cachedRelations.should.have.property('posts');
                    user.__cachedRelations.posts.forEach(function(pp) {
                        pp.userId.should.equal(user.id);
                        pp.__cachedRelations.should.have.property('author');
                        var author = pp.__cachedRelations.author;
                        author.id.should.equal(user.id);
                    });
                }
            });
            done();
        });
    });

    it('should fetch User - Posts AND Passports', function(done) {
        User.all({include: ['posts', 'passports']}, function(err, users) {
            should.not.exist(err);
            should.exist(users);
            users.length.should.be.ok;
            users.forEach(function(user) {
                user.__cachedRelations.should.have.property('posts');
                user.__cachedRelations.should.have.property('passports');
                user.__cachedRelations.posts.forEach(function(p) {
                    p.userId.should.equal(user.id);
                });
                user.__cachedRelations.passports.forEach(function(pp) {
                    pp.ownerId.should.equal(user.id);
                });
            });
            done();
        });
    });

});

function setup(done) {
    db = getSchema();
    City = db.define('City');
    Street = db.define('Street');
    Building = db.define('Building');
    User = db.define('User', {
        name: String,
        age: Number
    });
    Passport = db.define('Passport', {
        number: String
    });
    Post = db.define('Post', {
        title: String
    });

    Passport.belongsTo('owner', {model: User});
    User.hasMany('passports', {foreignKey: 'ownerId'});
    User.hasMany('posts', {foreignKey: 'userId'});
    Post.belongsTo('author', {model: User, foreignKey: 'userId'});

    db.automigrate(function() {
        var createdUsers = [];
        var createdPassports = [];
        var createdPosts = [];
        createUsers();
        function createUsers() {
            clearAndCreate(
                User,
                [
                    {name: 'User A', age: 21},
                    {name: 'User B', age: 22},
                    {name: 'User C', age: 23},
                    {name: 'User D', age: 24},
                    {name: 'User E', age: 25}
                ],
                function(items) {
                    createdUsers = items;
                    createPassports();
                }
            );
        }

        function createPassports() {
            clearAndCreate(
                Passport,
                [
                    {number: '1', ownerId: createdUsers[0].id},
                    {number: '2', ownerId: createdUsers[1].id},
                    {number: '3'}
                ],
                function(items) {
                    createdPassports = items;
                    createPosts();
                }
            );
        }

        function createPosts() {
            clearAndCreate(
                Post,
                [
                    {title: 'Post A', userId: createdUsers[0].id},
                    {title: 'Post B', userId: createdUsers[0].id},
                    {title: 'Post C', userId: createdUsers[0].id},
                    {title: 'Post D', userId: createdUsers[1].id},
                    {title: 'Post E'}
                ],
                function(items) {
                    createdPosts = items;
                    done();
                }
            );
        }

    });
}

function clearAndCreate(model, data, callback) {
    var createdItems = [];
    model.destroyAll(function () {
        nextItem(null, null);
    });

    var itemIndex = 0;
    function nextItem(err, lastItem) {
        if (lastItem !== null) {
            createdItems.push(lastItem);
        }
        if (itemIndex >= data.length) {
            callback(createdItems);
            return;
        }
        model.create(data[itemIndex], nextItem);
        itemIndex++;
    }
}