fix #429 Multiple Models can't mixin same class

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

lib/jutil.js

@@ -1,4 +1,5 @@
 var util = require('util');
+var _ = require('lodash');
 /**
  *
  * @param newClass
@@ -61,7 +62,7 @@ exports.mixin = function (newClass, mixinClass, options) {
   if (options.instanceProperties && mixinClass.prototype) {
     mixInto(mixinClass.prototype, newClass.prototype, options);
   }
-  
+
   return newClass;
 };
 
@@ -75,11 +76,12 @@ function mixInto(sourceScope, targetScope, options) {
     var isDelegate = isFunc && targetProperty.value._delegate;
     var shouldOverride = options.override || !targetPropertyExists || isDelegate;
 
+    if (propertyName == '_mixins') {
+      targetScope._mixins = _.union(targetScope._mixins, sourceScope._mixins);
+      return;
+    }
+
     if (shouldOverride) {
-      if (sourceIsFunc) {
-        sourceProperty.value = sourceProperty.value;
-      }
-      
       Object.defineProperty(targetScope, propertyName, sourceProperty);
     }
   });

test/mixins.test.js

@@ -41,7 +41,7 @@ function timestamps(Model, options) {
 mixins.define('TimeStamp', timestamps);
 
 describe('Model class', function () {
-  
+
   it('should define mixins', function() {
     mixins.define('Example', function(Model, options) {
       Model.prototype.example = function() {
@@ -56,7 +56,7 @@ describe('Model class', function () {
       Model.multiMixin[options.key] = options.value;
     });
   });
-  
+
   it('should apply a mixin class', function() {
     var Address = modelBuilder.define('Address', {
       street: { type: 'string', required: true },
@@ -69,34 +69,34 @@ describe('Model class', function () {
     });
 
     var properties = Item.definition.properties;
-    
+
     properties.street.should.eql({ type: String, required: true });
     properties.city.should.eql({ type: String, required: true });
   });
-  
+
   it('should apply mixins', function(done) {
     var memory = new DataSource('mem', {connector: Memory}, modelBuilder);
     var Item = memory.createModel('Item', { name: 'string' }, {
-      mixins: { 
+      mixins: {
         TimeStamp: true, Demo: { value: true },
         Multi: [
-          { key: 'foo', value: 'bar' }, 
+          { key: 'foo', value: 'bar' },
           { key: 'fox', value: 'baz' }
         ]
       }
     });
-    
+
     Item.mixin('Example', { foo: 'bar' });
-    
+
     Item.demoMixin.should.be.true;
-    
+
     Item.multiMixin.foo.should.equal('bar');
     Item.multiMixin.fox.should.equal('baz');
-    
+
     var properties = Item.definition.properties;
     properties.createdAt.should.eql({ type: Date });
     properties.updatedAt.should.eql({ type: Date });
-    
+
     Item.create({ name: 'Item 1' }, function(err, inst) {
       inst.createdAt.should.be.a.date;
       inst.updatedAt.should.be.a.date;
@@ -104,5 +104,37 @@ describe('Model class', function () {
       done();
     });
   });
-  
+
+  describe('#mixin()', function () {
+
+    var Person, Author, Address;
+
+    beforeEach(function () {
+      Address = modelBuilder.define('Address', {
+        street: { type: 'string', required: true },
+        city: { type: 'string', required: true }
+      });
+      var memory = new DataSource('mem', {connector: Memory}, modelBuilder);
+      Person = memory.createModel('Person', { name: 'string' });
+      Author = memory.createModel('Author', { name: 'string' });
+    });
+
+    it('should register mixin class into _mixins', function () {
+      Person.mixin(Address);
+      Person._mixins.should.containEql(Address);
+    });
+
+    it('should NOT share mixins registry', function () {
+      Person.mixin(Address);
+      Author._mixins.should.not.containEql(Address);
+    });
+
+    it('should able to mixin same class', function () {
+      Person.mixin(Address);
+      Author.mixin(Address);
+      Author._mixins.should.containEql(Address);
+    });
+
+  });
+
 });