feat(record-api): makes $decode throw if encoded value is null or not an object.

Also makes update and create ignore response data if empty.

Author: iobaixas

src/module/api/record-api.js

@@ -188,6 +188,9 @@ RMModule.factory('RMRecordApi', ['RMUtils', function(Utils) {
      * @return {RecordApi} this
      */
     $decode: function(_raw, _mask) {
+
+      Utils.assert(_raw && typeof _raw == 'object', 'Record $decode expected an object');
+
       // IDEA: let user override serializer
       this.$type.decode(this, _raw, _mask || Utils.READ_MASK);
       if(this.$isNew()) this.$pk = this.$type.inferKey(_raw); // TODO: warn if key changes
@@ -323,8 +326,9 @@ RMModule.factory('RMRecordApi', ['RMUtils', function(Utils) {
             .$dispatch('before-update', [request, !!_patch])
             .$dispatch('before-save', [request])
             .$send(request, function(_response) {
+              if(_response.data) this.$unwrap(_response.data);
+
               this
-                .$unwrap(_response.data)
                 .$dispatch('after-update', [_response, !!_patch])
                 .$dispatch('after-save', [_response]);
             }, function(_response) {
@@ -342,7 +346,7 @@ RMModule.factory('RMRecordApi', ['RMUtils', function(Utils) {
             .$dispatch('before-save', [request])
             .$dispatch('before-create', [request])
             .$send(request, function(_response) {
-              this.$unwrap(_response.data);
+              if(_response.data) this.$unwrap(_response.data);
 
               // reveal item (if not yet positioned)
               if(this.$scope.$isCollection && this.$position === undefined && !this.$preventReveal) {

test/computed-spec.js

@@ -42,7 +42,8 @@ describe('RMBuilderComputed', function() {
             }
           }
         });
-        device = DeviceModel.$new().$decode();
+
+        device = DeviceModel.$new().$decode({});
       });
 
       it('calculates using given function', function() {

test/model-spec.js

@@ -230,6 +230,13 @@ describe('Restmod model class:', function() {
         $httpBackend.flush();
       });
 
+      it('should ignore empty responses', function() {
+        expect(function() {
+          bike.$save();
+          $httpBackend.when('PUT', '/api/bikes/1').respond(200, '');
+          $httpBackend.flush();
+        }).not.toThrow();
+      });
     });
 
     it('should call callbacks in proper order when creating', function() {
@@ -336,7 +343,7 @@ describe('Restmod model class:', function() {
   describe('$unwrap', function() {
 
     it('should call the type\'s unpack method', function() {
-      var spy = jasmine.createSpy();
+      var spy = jasmine.createSpy().and.returnValue({});
       var bike = restmod.model('/api/bikes', {
         'Model.unpack': spy
       }).$build();