[BUGFIX release] Disable polymorphic deserialization when a model exp…

…ects a type attribute

b7f7b7a introduced a bug where if there is a type key in a payload that is part
of an array, it would be used for polymorphic deserialization even when the
model expects an attribute that is named "type".

Interestingly, for such payloads, `arrayHash` passed into `normalizeArray()` in
rest-serializer.js contains Ember.Object instances as opposed to plain objects.
This causes the code to throw, since `hash.type` would be a computed property
in that case. This is probably because of extending from JSONAPISerializer.

packages/ember-data/lib/serializers/rest-serializer.js

@@ -8,6 +8,7 @@ import {singularize} from "ember-inflector/lib/system/string";
 import coerceId from "ember-data/system/coerce-id";
 
 var camelize = Ember.String.camelize;
+var get = Ember.get;
 
 /**
   Normally, applications will use the `RESTSerializer` by implementing
@@ -148,8 +149,10 @@ var RESTSerializer = JSONSerializer.extend({
     let modelClass = store.modelFor(modelName);
     let serializer = store.serializerFor(modelName);
 
+    const primaryHasTypeAttribute = get(modelClass, 'attributes').get('type');
+    /*jshint loopfunc:true*/
     arrayHash.forEach((hash) => {
-      let { data, included } = this._normalizePolymorphicRecord(store, hash, prop, modelClass, serializer);
+      let { data, included } = this._normalizePolymorphicRecord(store, hash, prop, modelClass, serializer, primaryHasTypeAttribute);
       documentHash.data.push(data);
       if (included) {
         documentHash.included.push(...included);
@@ -159,10 +162,10 @@ var RESTSerializer = JSONSerializer.extend({
     return documentHash;
   },
 
-  _normalizePolymorphicRecord(store, hash, prop, primaryModelClass, primarySerializer) {
+  _normalizePolymorphicRecord(store, hash, prop, primaryModelClass, primarySerializer, primaryHasTypeAttribute) {
     let serializer, modelClass;
     // Support polymorphic records in async relationships
-    if (hash.type && store._hasModelFor(this.modelNameFromPayloadKey(hash.type))) {
+    if (!primaryHasTypeAttribute && hash.type && store._hasModelFor(this.modelNameFromPayloadKey(hash.type))) {
       serializer = store.serializerFor(hash.type);
       modelClass = store.modelFor(hash.type);
     } else {

packages/ember-data/tests/integration/serializers/rest-serializer-test.js

@@ -1,4 +1,4 @@
-var HomePlanet, league, SuperVillain, EvilMinion, YellowMinion, DoomsdayDevice, Comment, env;
+var HomePlanet, league, SuperVillain, EvilMinion, YellowMinion, DoomsdayDevice, Comment, Basket, env;
 var run = Ember.run;
 
 module("integration/serializer/rest - RESTSerializer", {
@@ -29,20 +29,26 @@ module("integration/serializer/rest - RESTSerializer", {
       root: DS.attr('boolean'),
       children: DS.hasMany('comment', { inverse: null, async: false })
     });
+    Basket = DS.Model.extend({
+      type: DS.attr('string'),
+      size: DS.attr('number')
+    });
     env = setupStore({
       superVillain:   SuperVillain,
       homePlanet:     HomePlanet,
       evilMinion:     EvilMinion,
       yellowMinion:   YellowMinion,
       doomsdayDevice: DoomsdayDevice,
-      comment:        Comment
+      comment:        Comment,
+      basket:         Basket
     });
     env.store.modelFor('super-villain');
     env.store.modelFor('home-planet');
     env.store.modelFor('evil-minion');
     env.store.modelFor('yellow-minion');
     env.store.modelFor('doomsday-device');
     env.store.modelFor('comment');
+    env.store.modelFor('basket');
   },
 
   teardown: function() {
@@ -588,3 +594,28 @@ test("normalizeResponse can load secondary records of the same type without affe
     }]
   });
 });
+
+test("don't polymorphically deserialize base on the type key in payload when a type attribute exist", function() {
+  env.registry.register('serializer:application', DS.RESTSerializer.extend({
+    isNewSerializerAPI: true
+  }));
+
+  run(function() {
+    env.restSerializer.normalizeArrayResponse(env.store, Basket, {
+      basket: [
+        env.store.createRecord('Basket', { type: 'bamboo', size: 10, id: '1' }),
+        env.store.createRecord('Basket', { type: 'yellowMinion', size: 10, id: '65536' })
+      ]
+    });
+  });
+
+  const normalRecord = env.store.peekRecord('basket', '1');
+  ok(normalRecord, "payload with type that doesn't exist");
+  strictEqual(normalRecord.get('type'), 'bamboo');
+  strictEqual(normalRecord.get('size'), 10);
+
+  const clashingRecord = env.store.peekRecord('basket', '65536');
+  ok(clashingRecord, 'payload with type that matches another model name');
+  strictEqual(clashingRecord.get('type'), 'yellowMinion');
+  strictEqual(clashingRecord.get('size'), 10);
+});