为什么 rails 不生成对象类型

Question

由于某种原因，我的控制器创建的任何 json 都会生成一个 json 数组，但不会生成一个对象。我想知道它的行为是否正常？如果是我如何获得我正在寻找的东西。

这里是控制器

def index
  @articles = Article.all
  respond_to do |format|
    format.json  { render :json => @events }
  end
end

现在这是我实际得到的

[{"allday":true,"created_at":"2013-01-10T23:49:19Z","customer_id":1,"description":"A meeting tomorrow between Prime Minister","id":35}]

现在我想先看看对象，就像标准的 json 已经遵循了

{ "Article":{"allday":true,"created_at":"2013-01-10T23:49:19Z","customer_id":1,"description":"A meeting tomorrow between Prime Minister","id":35}}

Answer 1

您应该启用ActiveRecord::Base.include_root_in_json 以获得您想要的全局行为。来自the docs：

include_root_in_json 选项控制顶层行为 as_json。如果为真（默认）as_json 将发出单个根节点 以对象的类型命名。例如：

user = User.find(1)
user.as_json
# => { "user": {"id": 1, "name": "Konata Izumi", "age": 16,
#               "created_at": "2006/08/01", "awesome": true} }

ActiveRecord::Base.include_root_in_json = false

user.as_json
# => {"id": 1, "name": "Konata Izumi", "age": 16,
#     "created_at": "2006/08/01", "awesome": true}

也可以通过将:root 选项设置为false 来实现此行为，如下所示：

user = User.find(1)
user.as_json(root: false)
# =>  {"id": 1, "name": "Konata Izumi", "age": 16,
#      "created_at": "2006/08/01", "awesome": true}

Answer 2

您可以构建一个 ruby​​ 对象或哈希来反映您想要返回的 json 对象的结构并渲染它。

def index
  @articles = Article.all
  respond_to do |format|
    format.json  { render :json => @events.map { |e| { Article: e } } }
  end
end

这会给你类似的东西

[{ "Article":{"allday":true,"created_at":"2013-01-10T23:49:19Z","customer_id":1,"description":"A meeting tomorrow between Prime Minister","id":35}}]