Fix syncing of deleted properties

addon/serializers/firebase.js

@@ -9,6 +9,25 @@ import assign from 'lodash/object/assign';
 export default DS.JSONSerializer.extend(DS.EmbeddedRecordsMixin, {
   isNewSerializerAPI: true,
 
+  /**
+   * Firebase does not send null values, it omits the key altogether. This nullifies omitted
+   * properties so that property deletions sync correctly.
+   *
+   * @override
+   */
+  extractAttributes: function (modelClass, resourceHash) {
+    var attributes = this._super(modelClass, resourceHash);
+
+    // nullify omitted attributes
+    modelClass.eachAttribute(function (key) {
+      if (!attributes.hasOwnProperty(key)) {
+        attributes[key] = null;
+      }
+    });
+
+    return attributes;
+  },
+
   /**
    * @override
    */

changelog.txt

@@ -0,0 +1 @@
+fixed - Deleted model properties were not synchronizing.

tests/integration/updates-from-server-test.js

@@ -60,22 +60,30 @@ describe('Integration: FirebaseAdapter - Updates from server', function() {
   });
 
   describe('A record coming from find', function() {
-    var newPost;
+    var reference, newPost;
 
     beforeEach(function(done) {
-      var reference = adapter._ref;
+      reference = adapter._ref;
       Ember.run(function() {
         store.findRecord('post', 'post_1').then(function(post) {
           newPost = post;
-          reference.child('posts/post_1/body').set('Updated', function() {
-            done();
-          });
+          done();
         });
       });
     });
 
-    it('receives server updates correctly', function() {
-      expect(newPost.get('body')).to.equal('Updated', 'property should change');
+    it('receives server updates correctly', function(done) {
+      reference.child('posts/post_1/body').set('Updated', function() {
+        expect(newPost.get('body')).to.equal('Updated', 'property should change');
+        done();
+      });
+    });
+
+    it('receives server property deletions correctly', function(done) {
+      reference.child('posts/post_1/body').remove(function() {
+        expect(newPost.get('body')).to.equal(null, 'property should be deleted');
+        done();
+      });
     });
 
     it('has the correct .ref()', function() {

tests/unit/serializers/firebase-test.js

@@ -427,7 +427,8 @@ describeModule(
 
           expect(json.included).to.have.length(1);
           expect(json.included[0].attributes).to.deep.equal({
-            firstName: 'Adam'
+            firstName: 'Adam',
+            created: null
           });
 
           expect(json.included[0].id).to.equal('aputinski');
@@ -486,7 +487,8 @@ describeModule(
 
         expect(json.included).to.have.length(1);
         expect(json.included[0].attributes).to.deep.equal({
-          firstName: 'Adam'
+          firstName: 'Adam',
+          created: null
         });
 
         expect(json.included[0].id).to.equal('aputinski');