在Rails中使用:include默认为to_json [英] defaults for to_json in Rails with :include

问题描述

让我们说我有一个属于用户的模型帖子.要转换为json，我要做类似的事情

Let us say I have a model Post which belongs to a User. To convert to json, I do something like this

@reply.to_json(:include => {:user => {:only => [:email, :id]}, 
               :only => [:title, :id])

但是，我想为此设置一些默认值，因此不必每次都指定:only.我正在尝试覆盖as_json以完成此操作.当我在User模型中添加as_json时，当我执行@ user.to_json时会调用它，但是当用户包含在@ reply.to_json中时，我为User覆盖的as_json将被忽略.

However, I want to set some defaults for this so I don't have to specify :only everytime. I am trying to override as_json to accomplish this. When I add as_json in User model, it is called when I do @user.to_json but when user is included in @reply.to_json, my overriden as_json for User is ignored.

我如何进行这项工作?

How do I make this work?

谢谢

推荐答案

您可以通过覆盖模型中的serializable_hash来做到这一点，就像这样:

You can do this by overriding serializable_hash in your model, like so:

class Reply < ActiveRecord::Base
  def serializable_hash(options={})
    options = { 
      :include => {:user => {:only => [:email, :id]}, 
      :only => [:title, :id]
    }.update(options)
    super(options)
  end
end

这将影响所有可序列化的方法，包括serializable_hash，to_json和to_xml.

This will affect all serializable methods, including serializable_hash, to_json, and to_xml.

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