Rails 4 Grape API ActionController :: RoutingError

Question

我正在尝试使用json格式对其所有动词进行Grape API回答.问题是我无法以json格式回答路由错误.我甚至无法解救ActionController :: RoutingError.

我已经阅读了这个链接https://github.com/intridea/grape/pull/342并且我已经将cascade指令设置为false,但API仅以纯文本形式回答"Not Found".

$ curl -X GET http://localhost:3000/api/wrong_uri
Not Found

使用详细选项:

$ curl -X GET http://localhost:3000/api/wrong_uri -v
* About to connect() to localhost port 3000 (#0)
*   Trying 127.0.0.1... connected
> GET /api/wrong_uri HTTP/1.1
> User-Agent: curl/7.22.0 (i686-pc-linux-gnu) libcurl/7.22.0 OpenSSL/1.0.1 zlib/1.2.3.4 libidn/1.23 librtmp/2.3
> Host: localhost:3000
> Accept: */*
> 
< HTTP/1.1 404 Not Found 
< Content-Type: text/html
< Cache-Control: no-cache
< X-Request-Id: 3cc74a78-3295-4c1f-b989-66d6fac50e5c
< X-Runtime: 0.002980
< Server: WEBrick/1.3.1 (Ruby/2.1.1/2014-02-24)
< Date: Tue, 06 May 2014 05:46:33 GMT
< Content-Length: 9
< Connection: Keep-Alive
< 
* Connection #0 to host localhost left intact
* Closing connection #0
Not Found

我的葡萄文件/app/api/api.rb

module API
  class Base < Grape::API
    format :json
    default_error_formatter :json
    cascade false

    rescue_from CanCan::AccessDenied do |e|
      Rack::Response.new({ error: "Forbidden", detail: "Access denied", status: '403' }.to_json, 403).finish
    end

    # it doesn't catch ActionController::RoutingError
    # rescue_from :all do |e|
    #   error_response({ message: "rescued from #{e.class.name}" })
    # end

    helpers ApiHelpers

    mount API::Auth
    mount API::V2
    mount API::V1
  end
end

Answer 1

通过指定cascade false你说Grape应该被允许处理HTTP错误而不受Rails的干扰.因此,当请求API的挂载点下面的不匹配的URI时,不ActionController::RoutingError生成任何内容(这将由 Rails完成),而是逐字地返回Grape的默认"不匹配的路由"处理程序的输出.有点无益,这个处理程序生成一个简单的"Not Found"消息,即使format :json已经指定了,这就是你所看到的行为.

解决方案是提供您自己的匹配器来捕获除您V1和V2模块中指定的路径之外的路由.尝试将此代码添加到三个语句API::Base 下面mount:

# Generate a properly formatted 404 error for all unmatched routes except '/'
route :any, '*path' do
  error!({ error:  'Not Found',
           detail: "No such route '#{request.path}'",
           status: '404' },
         404)
end

# Generate a properly formatted 404 error for '/'
route :any do
  error!({ error:  'Not Found',
           detail: "No such route '#{request.path}'",
           status: '404' },
         404)
end

当然,您需要编辑每个route块的主体以满足您的需求.

出于某种原因,两个街区似乎都是必要的,以捕捉所有无法比拟的路线; 这是Grape的匹配器语法或我的理解的限制.