       @loading = true
       @fetch
         silent: true
+        loading: true
         success: (model, response, options) =>
           @loading = false
 

      if (!_.isArray(models)) then (models = if models then [models] else [])

      _.each models, (model, index, arr) =>
        @get('contents').add(model)

      if not options?.silent then @trigger('change')


      else
        (attrs = {})[key] = val

      options = options || {}
      contents = attrs.contents
      attrs.contents = @get('contents') or new Container()

