Fix bug in hasMany.set when models have custom primary keys, add unit test

lib/associations/has-many-double-linked.js

@@ -105,13 +105,13 @@ module.exports = (function() {
 
 
     unassociatedObjects = newAssociations.filter(function (obj) {
     unassociatedObjects = newAssociations.filter(function (obj) {
       return !Utils._.find(oldAssociations, function (old) {
       return !Utils._.find(oldAssociations, function (old) {
-        return (!!obj[foreignIdentifier] && !!old[foreignIdentifier] ? obj[foreignIdentifier] === old[foreignIdentifier] : obj.id === old.id)
+        return (!!obj[foreignIdentifier] ? obj[foreignIdentifier] === old[foreignIdentifier] : (!!obj[targetKeys[0]] ? obj[targetKeys[0]] === old[targetKeys[0]] : obj.id === old.id))
       })
       })
     })
     })
 
 
     oldAssociations.forEach(function (old) {
     oldAssociations.forEach(function (old) {
       var newObj = Utils._.find(newAssociations, function (obj) {
       var newObj = Utils._.find(newAssociations, function (obj) {
-        return (!!obj[foreignIdentifier] && !!old[foreignIdentifier] ? obj[foreignIdentifier] === old[foreignIdentifier] : obj.id === old.id)
+        return (!!obj[foreignIdentifier] ? obj[foreignIdentifier] === old[foreignIdentifier] : (!!obj[targetKeys[0]] ? obj[targetKeys[0]] === old[targetKeys[0]] : obj.id === old.id))
       })
       })
 
 
       if (!newObj) {
       if (!newObj) {

test/associations/has-many.test.js

@@ -680,6 +680,34 @@ describe(Support.getTestDialectTeaser("HasMany"), function() {
         })
         })
       })
       })
 
 
+      it("sets new associations with custom primary keys", function (done) {
+        var User = this.sequelize.define('User', { uid: { type:DataTypes.INTEGER, primaryKey:true, autoIncrement: true }, username: DataTypes.STRING })
+          , Task = this.sequelize.define('Task', { tid: { type:DataTypes.INTEGER, primaryKey:true, autoIncrement: true }, title: DataTypes.STRING })
+          
+        User.hasMany(Task)
+        Task.hasMany(User)
+
+        User.sync({ force: true }).success(function () {
+          Task.sync({ force: true }).success(function () {
+            User.create({ username: 'foo' }).success(function (user) {
+              Task.create({ title: 'task' }).success(function (task) {
+                task.setUsers([ user ]).success(function () {
+                  User.create({ username: 'bar' }).success(function (user2) {
+                    user2.user_has_task = {usertitle: "Something"};
+                    task.setUsers([ user, user2 ]).success(function () {
+                      task.getUsers().success(function (_users) {
+                        expect(_users).to.have.length(2)
+                        done()
+                      })
+                    })
+                  })
+                })
+              })
+            })
+          })
+        })
+      })
+
       it("joins an association with custom primary keys", function(done) {
       it("joins an association with custom primary keys", function(done) {
         var Group = this.sequelize.define('group', {
         var Group = this.sequelize.define('group', {
             group_id: {type: DataTypes.INTEGER, primaryKey: true},
             group_id: {type: DataTypes.INTEGER, primaryKey: true},