Rails wrap_parameters vs include_root_in_json，有什么区别?

问题描述

在一个新的 Rails 3.2 应用程序中，您可以在 config/initializers/wrap_parameters.rb 中找到以下几行:

In a new Rails 3.2 app you can find in config/initializers/wrap_parameters.rb the following lines:

ActiveSupport.on_load(:action_controller) do
  wrap_parameters format: [:json]
end

# Disable root element in JSON by default.
ActiveSupport.on_load(:active_record) do
  self.include_root_in_json = false
end

我对第二个代码块的理解是，如果您将对象转换为 json，它将不包含根节点(即用户 => {:name => 'John'}，而只是 {:name=> '约翰'}

My understanding for the second code block is that if you convert a object to json, it will not include a root node (i.e. users => {:name => 'John'}, rather it will be just {:name => 'john'}

那么第一个 wrap_parameters 块做了什么?它作用于 action_controller.. 为什么?

What then does the first wrap_parameters block do? It acts on action_controller.. why?

推荐答案

include_root_in_json 是在 Rails 中包装 json 实例化

include_root_in_json is to wrap json instantiated in Rails

wrap_parameters 是对从请求中接收到的 json 进行包装.

wrap_parameters is to wrap json received from a request.

如果您启用了 wrap_parameters，并且您通过 POST 命令将以下 json 发送到 Rails:

If you have wrap_parameters enabled, and if you send the following json through a POST command to Rails:

{name: 'John Smith'}

Rails 会自动将它收到的 JSON 包装成:

Rails will automatically wrap the JSON it received into:

{"person": {name: 'John Smith'}}

include_root_in_json，另一方面，是 json Rails 生成 对象是否通过 to_json 命令包装.

include_root_in_json, on the other hand, is whether the json Rails generates from an object is wrapped or not through the to_json command.

例如Person.to_json.如果启用 include_root_in_json，您将获得:

e.g. Person.to_json. If include_root_in_json is enabled, you'll get:

{"person": {name: 'James Brown'}}

否则，你只会得到

{name: 'John Smith'}

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