ruby-on-rails-3 – 在模型更改重新渲染时,一些嵌套属性消失

class InboxItemView extends Backbone.View
    initialize: ->
      @model.on('change',@render,@)
    render: ->
      @$el.html JST['buy/messages/templates/received_message'](@model.toJSON())
      @

  class InboxListView extends Backbone.View
    items: []
    initialize: ->
      @collection.on('reset',@reset,@)
    reset: ->
      _.each @items,(item) -> item.remove()
      @items = _.map @collection.received(),(model) =>
        item = new InboxItemView(model: model)
        @$('tbody').append item.render().el
        item

模型

class Message extends Backbone.Model

  class Messages extends Backbone.Collection
    model: Message
    url: '/messages'
    received: -> @filter (message) -> message.get('receiver').id == gon.userId

Rabl的：

object @message
attributes :id,:title,:body,:read_at,:created_at,:last_reply

node :path do |message|
  message_path(message)
end

child :sender => :sender do
  attributes :id,:nickname
end

child :receiver => :receiver do
  attributes :id,:nickname
end

在初始渲染期间,一切都正常显示.但是,当我更改模型并重新呈现列表项时,模型的发送方哈希变为空.因此,渲染不会打印出发件人的名称.属性喜欢标题仍然显示,因为它们不是嵌套的.

为什么嵌套属性会消失？我在渲染一些中间模型吗？