fix recursive calls if create belongsTo model in beforeCreate hook

Signed-off-by: Clark Wang <clark.wangs@gmail.com>

lib/relation-definition.js

@@ -1192,11 +1192,16 @@ BelongsTo.prototype.create = function(targetModelData, cb) {
   modelTo.create(targetModelData, function(err, targetModel) {
     if(!err) {
       modelInstance[fk] = targetModel[pk];
+      if (modelInstance.isNewRecord()) {
+        self.resetCache(targetModel);
+        cb && cb(err, targetModel);
+      } else {
         modelInstance.save(function(err, inst) {
           if (cb && err) return cb && cb(err);
           self.resetCache(targetModel);
           cb && cb(err, targetModel);
         });
+      }
     } else {
       cb && cb(err);
     }

test/relations.test.js

@@ -1657,6 +1657,23 @@ describe('relations', function () {
       });
     });
 
+    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();
+      });
+    });
+
   });
   
   describe('belongsTo with scope', function () {
@@ -1680,9 +1697,12 @@ describe('relations', function () {
         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) {