使用 ActionController::Metal 处理 ActiveRecord::RecordNotFound

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问题描述

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我正在开发 (JSON) API 阶段并决定从 ActionController::Metal 继承我的 ApiController 以利用速度等.

I'm on the developing (JSON) API stage and decide to inherit my ApiController from ActionController::Metal to took advantages of speed etc.

所以我包含了一堆模块来让它工作.

So I've included a bunch of modules to make it work.

最近我决定在未找到记录时以空结果响应.Rails 已经从 Model#find 方法中抛出 ActiveRecord::RecordNotFound 并且我一直在尝试使用 rescue_from 来捕获它并编写这样的东西:

Recently I've decide to respond with empty result when record not found. Rails already throws ActiveRecord::RecordNotFound from Model#find method and I've been trying to use rescue_from to catch it and write something like this:

module Api::V1
  class ApiController < ActionController::Metal
    # bunch of included modules 

    include ActiveSupport::Rescuable

    respond_to :json

    rescue_from ActiveRecord::RecordNotFound do
      binding.pry
      respond_to do |format|
        format.any { head :not_found }
      end
    end
  end
end  

调用我的简单操作后

def show
  @post = Post.find(params[:id])
end

而且执行永远不会到达rescue_from.这是抛出:

And execution never reach rescue_from. It's throws:

ActiveRecord::RecordNotFound (Couldn't find Post with id=1

进入我的日志文件.

我一直在尝试并处于生产模式.服务器以 404 响应，但响应正文是 JSON 请求的标准 HTML 错误页面.

I've been trying it and in production mode. Server responds with 404 but response body is standard HTML error page for JSON request.

当我将继承从 ActionController::Metal 更改为 ActionController::Base 时效果很好.

It's works well when I change inheritance from ActionController::Metal to ActionController::Base.

您可能会注意到缺少 respond_with 调用.那是因为我使用 RABL 作为我的模板系统.

You may notice about lack of respond_with call. That's because I'm using RABL as my template system.

所以问题是:有没有机会让 rescue_from 与 Metal 一起工作或从响应中摆脱 HTML?

So the question is: Is there any chances to make rescue_from work with Metal or get rid HTML from response?

推荐答案

以下对我有用:

class ApiController < ActionController::Metal
  include ActionController::Rendering
  include ActionController::MimeResponds
  include ActionController::Rescue

  append_view_path Rails.root.join('app', 'views').to_s
  rescue_from ActiveRecord::RecordNotFound, with: :four_oh_four

  def four_oh_four
    render file: Rails.root.join("public", "404.html"), status: 404
  end
end

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