将has_many结果包含在REST JSON结果中 [英] Include has_many results in REST JSON result

问题描述

我有一个名为List的模型，该模型为has_many :entries.像往常一样，Rails 3为List

I have a Model called List that has_many :entries. As usual, Rails 3 generated this show method for List

def show
    @list = List.find(params[:id])

    respond_to do |format|
      format.html # show.html.erb
      format.json { render json: @list }
    end
end

如何更改format.json以将json响应中的entries结果也包括在json响应中?

How can I change format.json to include the entries results from @list in the json response as well?

我知道我可以将@list转换为Hash，将.entries的Hash值添加到该值，然后渲染该Hash，但是我怀疑Rails袖手旁观.

I know I could convert @list to a Hash, add the Hash value of .entries to that, then render the Hash, but I suspect that Rails has a more elegant trick up its sleeve.

推荐答案

是的，您可以为to_json提供一个:include选项:

Yes, there's an :include option you can give to to_json:

format.json { render json: @list.to_json(:include => :entries) }

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