model.save() with promise

models.coffee

    save: (data, options = {}) ->
      entity = @
      isNew = @isNew()

      success = _.bind(@saveSuccess, @, isNew, options.collection, options.callback)
      error = _.bind(@saveError, @)

      promise = new Promise (resolve, reject) ->
        _.defaults options,
          wait: true

          success: ->
            success.apply(@, arguments)
            resolve(entity)

          error: (entity, response) ->
            App.log.error('API Sync Error in loadRelations():', response)
            error.apply(@, arguments)
            #reject(new Error('API Sync Error in relations'))
            err = new Error('API Sync Error ')
            err.response = response
            reject(err)

      @unset('_errors')
      super(data, options)
      return promise