用concerns来管理models

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   # autoload concerns
  
  
  
  
  
  
  
  


   
   
   
   module 
   
   
   
   YourApp

  
  
  
  
  
  
  
  

   
   
   
     
   
   
   
   class 
   
   
   
   Application 
   
   
   
   < 
   
   
   
   Rails
   
   
   
   ::
   
   
   
   Application

  
  
  
  
  
  
  
  

   
   
   
       
   
   
   
   config
   
   
   
   .
   
   
   
   autoload_paths 
   
   
   
   += 
   
   
   
   %W(

  
  
  
  
  
  
  
  


   
   
   
         
   
   
   
   #{
   
   
   
   config
   
   
   
   .
   
   
   
   root
   
   
   
   }
   
   
   
   /app/controllers/concerns

  
  
  
  
  
  
  
  


   
   
   
         
   
   
   
   #{
   
   
   
   config
   
   
   
   .
   
   
   
   root
   
   
   
   }
   
   
   
   /app/models/concerns

  
  
  
  
  
  
  
  

   
   
   
       )
  
  
  
  
  
  
  
  

   
   
   
     
   
   
   
   end

  
  
  
  
  
  
  
  

   
   
   
   end
  
  
  
  
  
  
  
  

   
   
   
   

  
  
  
  
  
  
  
  

   
   
   
   # app/models/concerns/trashable.rb
  
  
  
  
  
  
  
  


   
   
   
   module 
   
   
   
   Trashable

  
  
  
  
  
  
  
  

   
   
   
     
   
   
   
   extend 
   
   
   
   ActiveSupport
   
   
   
   ::
   
   
   
   Concern

  
  
  
  
  
  
  
  

   
   
   
     
  
  
  
  
  
  
  
  

   
   
   
     
   
   
   
   included 
   
   
   
   do

  
  
  
  
  
  
  
  

   
   
   
       
   
   
   
   default_scope   
   
   
   
   where
   
   
   
   (
   
   
   
   trashed
   
   
   
   : 
   
   
   
   false
   
   
   
   )

  
  
  
  
  
  
  
  

   
   
   
       
   
   
   
   scope 
   
   
   
   :trashed
   
   
   
   , 
   
   
   
   where
   
   
   
   (
   
   
   
   trashed
   
   
   
   : 
   
   
   
   true
   
   
   
   )

  
  
  
  
  
  
  
  

   
   
   
     
   
   
   
   end

  
  
  
  
  
  
  
  

   
   
   
     
  
  
  
  
  
  
  
  

   
   
   
     
   
   
   
   def 
   
   
   
   trash

  
  
  
  
  
  
  
  

   
   
   
       
   
   
   
   update_attribute 
   
   
   
   :trashed
   
   
   
   , 
   
   
   
   true

  
  
  
  
  
  
  
  

   
   
   
     
   
   
   
   end

  
  
  
  
  
  
  
  

   
   
   
   end
  
  
  
  
  
  
  
  

   
   
   
   

  
  
  
  
  
  
  
  

   
   
   
   # app/models/message.rb
  
  
  
  
  
  
  
  


   
   
   
   class 
   
   
   
   Message 
   
   
   
   < 
   
   
   
   ActiveRecord
   
   
   
   ::
   
   
   
   Base

  
  
  
  
  
  
  
  

   
   
   
     
   
   
   
   include 
   
   
   
   Trashable
   
   
   
   , 
   
   
   
   Subscribable
   
   
   
   , 
   
   
   
   Commentable
   
   
   
   , 
   
   
   
   Eventable

  
  
  
  
  
  
  
  

   
   
   
   end