服务器上的Angular / Rails $ resource params

Question

有以下代码：

  $scope.event = new Event({ start_time: new Date(), animator_ids: [0] })
  $scope.event.start_time.setHours(0, 0, 0, 0)

  $scope.createEvent = ->
    $scope.event.animator_ids = [1, 2, 3]
    $scope.buttonText = "Saving..."
    $scope.event.$save ->
      $state.go('events.all')

和Rails服务器代码：

  def create
    render json: params and return
  end

JSON回复：

{"start_time":"2015-01-07T21:00:00.000Z","animator_ids":[1,2,3],"title":"1","description":"2","format":"json","action":"create","controller":"events","event":{"title":"1","description":"2","start_time":"2015-01-07T21:00:00.000Z"}}

我不明白为什么＆＃39; start_time＆＃39;在＆＃39;事件＆＃39;小组，但＆＃39; animator_ids＆＃39;不是！！我需要移动animator_ids＆＃39;对同一组，我该怎么办？谢谢！