extend serializer to support websocket responses

app/serializers/application.js

 import JSONSerializer from 'ember-data/serializers/json';
 
+/**
+ * Serializer used for any backend interaction.
+ * Used by Ember Data for rest interactions as well as by the changelog stream
+ *
+ * @class ApplicationSerializer
+ * @extends DS.JSONSerializer
+ */
 export default JSONSerializer.extend({
-    serialize: function(record, options) {
+    /**
+     * Enhances the compatibility with the RESTAdapter
+     * automatic detection of id and type does not work,
+     * type property inside data json is not what Ember expects
+     *
+     * @param  {Model} Model the class of the ember model used for record creation
+     * @param  {Object} data  raw object parsed from JSON API responses
+     * @return {[type]}   normalized record payload data (not yet a record instance)
+     */
+    normalize(Model, data){
+        const normalized = this._super.apply(this, arguments);
+        normalized.id = data.id;
+        normalized.type = data.type;
+        return normalized;
+    },
+    /**
+     * overwrites the default json serialisation such that serialised records always contain the id
+     *
+     * @param  {Model} record  the record from the Ember Data store
+     * @param  {Object} options serialisation options
+     * @return {Object}         a serialized version (plain JS object) of the record
+     */
+    serialize(record, options) {
         options = options || {};
         options.includeId = true;
         return this._super.call(this, record, options); // Get default serialization