Ruby on rails 3 如何重命名/别名rabl节点？

我正在开发一个Rails 3.2.14应用程序，我正在使用Rabl输出API数据。 我想更改下面输出的根节点通知和对象节点通知的名称。我该怎么做

{
  "total": 1,
  "notifications": [
    {
      "notification": {
        "id": 2,
        "subject": "Testing",
        "body": "Testing",
        "created_at": "16 Jan 2014 14:22",
        "conversation": 2,
        "sender_id": 5,
        "sender_name": "Mike Swanson"
      }
    }
  ]
}

show.rabl文件：

object false
node(:total) { @output.count }
child(@output) { extends 'api/v1/shared/conversation_rich' }

对话内容包含丰富的文件：

attributes :id, :subject, :body

node(:created_at) { |message| message.created_at.strftime("%e %b %Y %H:%M") }
node(:conversation) { |message| message.conversation.id }
node(:sender_id) { |message| message.sender.id }
node(:sender_name) { |message| message.sender.fullname }

更新

---

结果证明它非常简单。只需添加=>：消息：

child(@output => :messages) { extends 'api/v1/shared/conversation_rich' }

child(@output => :messages) { extends 'api/v1/shared/conversation_rich' }

---

结果证明它非常简单。只需添加=>：消息：

child(@output => :messages) { extends 'api/v1/shared/conversation_rich' }

child(@output => :messages) { extends 'api/v1/shared/conversation_rich' }