Question

我正在尝试使用Ruby on Rails构建cms应用程序4.为了得到合适的控制器。我需要在使用它之前对查询字符串进行预处理在匹配方法中如下所示

# config/routes.rb    
Cms::Application.routes do         
varparameter=ENV["QUERY_STRING"]    
 @controller=preprocessqstring(varparameter)
 match '/cms/home', to: 'login#show', via: [:get, :post]
 match 'cms/:content(/:action(/:id(.:format)))',to: @controller+'#show', via: [:get, :post]
end

设置ENV [＆＃34; QUERY_STRING＆＃34;]我正在使用以下机架中间件

 # lib/httpvariables.rb
    require 'rack'
    class Httpvariables
        def initialize(app)
          @app = app
        end

        def call(env)
           @status, @headers, @response = @app.call(env)
          request=Rack::Request.new(env)
           ENV["REQUEST_URI"]=request.env["REQUEST_URI"]
           ENV["QUERY_STRING"]=request.env["QUERY_STRING"]
           ENV["SERVER_PORT"]=request.env["SERVER_PORT"]
           ENV["SERVER_PROTOCOL"]=request.env["SERVER_PROTOCOL"]
        [@status, @headers, self]
        end
     end

我在application.rb

中添加了这一行

# config/application.rb
config.middleware.use Rack::Httpvariables

令我惊讶的是，如果尝试启动rails服务器它的显示失败：

mundile@mundile-HP:~/RoR-workspace/workspace/cms$ rails server
=> Booting WEBrick
=> Rails 4.1.1 application starting in development on http://0.0.0.0:3000
=> Run `rails server -h` for more startup options
=> Notice: server is listening on all interfaces (0.0.0.0). Consider using 127.0.0.1 (--binding option)
=> Ctrl-C to shutdown server
Exiting
/home/mundile/RoR-workspace/workspace/cms/config/routes.rb:68:in `block in <top (required)>': undefined method `+' for nil:NilClass (NoMethodError)

我需要你的帮助来确定问题的原因。似乎ENV["QUERY_STRING"]给出了零，但为什么呢？感谢。

Answer 1

我将中间件代码更改为：

 # lib/httpvariables.rb
    require 'rack'
    class Httpvariables
        def initialize(app)
          @app = app
        end
        def call(env)
      request=Rack::Request.new(env)
      ENV["REQUEST_URI"]=request.env["REQUEST_URI"]
      ENV["QUERY_STRING"]=request.env["QUERY_STRING"]
      ENV["SERVER_PORT"]=request.env["SERVER_PORT"]
      ENV["BASE_URL"]=request.base_url
      @app.call(env)
    end
    end

这就像魅力一样我还使用此代码回答了这个问题：Rails access request in routes.rb for dynamic routes

我在Rails 4中的机架中间件没有执行

1 个答案: