如何在模块中使用'before_action'

问题描述

我想在模块中使用'before_action'。

不幸的是，我无法完成它。

我是googleing，但是我发现的一切都无法解决问题。

我的模块文件如下所示：

  module ShowController 
 include SimpleController 
 #before_action：set_object，only：[：show] 
 
 def show 
 set_object 
 end 
 end 
  

我想使用注释before_action行而不是show方法。

因此，我试图包含以下模块：

  include AbstractController :: Callbacks 
 include ActiveSupport :: Callbacks 
 include ActiveSupport :: Concern 
 include ActiveSupport 
  

另外，我试图require'active_support / all'或者core_ext。

我收到的error_message是：

<$ p对于SimpleController :: ShowController：Module
未定义的方法`class_attribute'



最后，什么都没有解决，我也找不到解决方案。 我认为这就是你想要做的：



  class SomeController< ActionController :: Base 
包含SimpleController 
结束
 $ b $模块SimpleController 
扩展ActiveSupport ::关注
 
包含做
 before_action： set_object，only：[：show] 
 end 
 end 
  




I would like to use 'before_action' in a module.

Unfortunately, I couldn't get it work.

I was googleing, but everything I found couldn't solve the problem.

My module file looks like the following:

module ShowController
  include SimpleController
  #before_action :set_object, only: [:show]

  def show
   set_object
  end
end

I would like to use the outcommented before_action line instead of the show method.

Therefore, I was trying to include the following modules:

  include AbstractController::Callbacks
  include ActiveSupport::Callbacks
  include ActiveSupport::Concern
  include ActiveSupport

Additionally, I tried to "require 'active_support/all'" or the core_ext.

The error_message I receive is:

 undefined method `class_attribute' for SimpleController::ShowController:Module

Finally, nothing worked out and I didn't find a solution.

解决方案

I think this is what you're trying to do:

class SomeController < ActionController::Base
  include SimpleController
end

module SimpleController
  extend ActiveSupport::Concern

  included do
    before_action :set_object, only: [:show]
  end
end

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