ruby-on-rails - 如何处理两个嵌套的兄弟姐妹，接下来是 to_json？

Question

to_json ActiveRecord 文档说这用于处理两个嵌套模型，其中评论嵌套在帖子中：

  konata.to_json(:include => { :posts => {
                                 :include => { :comments => {
                                               :only => :body } },
                                 :only => :title } })
  # => {"id": 1, "name": "Konata Izumi", "age": 16,
        "created_at": "2006/08/01", "awesome": true,
        "posts": [{"comments": [{"body": "1st post!"}, {"body": "Second!"}],
                   "title": "Welcome to the weblog"},
                  {"comments": [{"body": "Don't think too hard"}],
                   "title": "So I was thinking"}]}

假设我有两个嵌套但没有深度嵌套的模型。可以说它是一个用户模型和评论模型。嵌套模型就是我所说的嵌套兄弟。

我希望我的 json 看起来像这样：

x = { 
    "Blog": {
        "Comments": [
         {"id":1,"name":"John Doe"},
         {"id":2,"name":"Don Joeh"}
        ],
        "User": [
         {"id":2,"company":"ACME"},
         {"id":4,"company":"BUD"}]
    }
}

当我两次使用 include 方法时，我最终得到的是一系列深度嵌套的 json，其中用户是评论的孩子。怎么了？！

data.to_json(
        :include => { :blog => {
          :include => [{ :comments => {
            :except => SKIPPED_COLUMNS,
            :methods => [:_type]
          }},
          { :users => {
              :except => SKIPPED_COLUMNS,
              :methods => [:_type]
          }}],
          :except => SKIPPED_COLUMNS,
          :methods => [:_type]
        }},
        :except => SKIPPED_COLUMNS,
        :methods => [:_type]
      )

Answer 1

为什么你有blog两次？

blog.to_json(
    :include => { :blog => {

我认为，第二个blog不应该在那里。尝试这个：

blog.to_json(
  :include => [
    {
      :comments => {
        :except => SKIPPED_COLUMNS,
        :methods => [:_type]
      }
    }, {
      :users => {
        :except => SKIPPED_COLUMNS,
        :methods => [:_type]
      }
    }
  ],
  :except => SKIPPED_COLUMNS,
  :methods => [:_type]
)