Ruby on Rails - 为多个模型渲染 JSON [英] Ruby on Rails - Render JSON for multiple models

问题描述

我正在尝试以 JSON 格式呈现来自多个模型的结果.我的控制器中的以下代码仅呈现第一个结果集:

I am trying to render results from more than one model in JSON. The following code in my controller only renders the first result set:

  def calculate_quote
    @moulding = Moulding.find(params[:id])
    @material_costs = MaterialCost.all

    respond_to do |format|
      format.json  { render :json => @moulding }
      format.json  { render :json => @material_costs }
    end
  end

非常感谢任何帮助，谢谢.

Any help would be much appreciated, thanks.

推荐答案

实现此目的的一种方法是使用要渲染的对象创建哈希，然后将其传递给渲染方法.像这样:

One way you could do this is to create a hash with the objects you want to render, and then pass that to the render method. Like so:

respond_to do |format|
  format.json  { render :json => {:moulding => @moulding, 
                                  :material_costs => @material_costs }}
end

如果模型没有通过活动记录关联，那可能是您最好的解决方案.

If the models aren't associated through active record, that's probably your best solution.

如果关联确实存在，您可以将 :include 参数传递给渲染调用，如下所示:

If an association does exist, you can pass an :include argument to the render call, like so:

respond_to do |format|
  format.json  { render :json => @moulding.to_json(:include => [:material_costs])}
end

请注意，如果您采用这种方法，则不必在上一节中检索 @material_costs 变量，Rails 将自动从 @molding 变量中加载它.

Note that you wouldn't have to retrieve the @material_costs variable in the section above if you take this approach, Rails will automatically load it from the @moulding variable.

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