Merge pull request #3347 from wecc/json-serializer-fix

Implement modelNameFromPayloadKey in JSONSerializer

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

@@ -1,5 +1,6 @@
 import Serializer from "ember-data/system/serializer";
 import coerceId from "ember-data/system/coerce-id";
+import normalizeModelName from "ember-data/system/normalize-model-name";
 
 var get = Ember.get;
 var isNone = Ember.isNone;
@@ -607,6 +608,16 @@ var JSONSerializer = Serializer.extend({
     return relationships;
   },
 
+  /**
+    @method modelNameFromPayloadKey
+    @param {String} key
+    @return {String} the model's modelName
+  */
+  modelNameFromPayloadKey: function(key) {
+    return normalizeModelName(key);
+  },
+
+
   /**
     You can use this method to normalize all payloads, regardless of whether they
     represent single records or an array.