Rails渲染为json，包括嵌套属性和排序 [英] Rails render as json, include nested attribute and sort

问题描述

我正在尝试将一个对象呈现为json，包括嵌套属性，并按created_at属性对其进行排序.

I am trying to render an object as json, including nested attributes and sort them by created_at attribute.

我正在使用代码进行此操作:

I'm doing this using the code:

format.json  { render :json => @customer, :include => :calls}

如何按created_at属性对呼叫进行排序?

How can I sort calls by created_at attribute?

推荐答案

如果您认为Rails的工作原理，则调用只是与Call模型相关的一种方法.有几种方法可以做到这一点.一种是在关联上设置订单选项.

If you think how Rails works, calls is just a method that relates to the Call model. There are a few ways you can do this. One is to set the order option on the association. One is to change the default scope of the Call model globally, another creates a new method in the Customer model that returns the calls (useful if you wish to do anything with the calls before encoding.)

方法1:

class Customer < ActiveRecord::Base
  has_many :calls, :order => "created_at DESC"
end

更新

对于4或以上的滑轨，请使用:

For rails 4 and above use:

class Customer < ActiveRecord::Base
  has_many :calls, -> { order('created_at DESC') }
end

方法2:

class Call < ActiveRecord::Base
  default_scope order("created_at DESC")
end

方法3:

class Call < ActiveRecord::Base
  scope :recent, order("created_at DESC")
end

class Customer < ActiveRecord::Base
  def recent_calls
    calls.recent
  end
end

然后您可以使用:

format.json  { render :json => @customer, :methods => :recent_calls}

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