controller concerns in rails 4, sharing actions -

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I am trying to share an action between controllers using a concern for example: 

  Extend the module backend module ActiveSupport :: do the anxiety DRAF response_to | Format | [Edit] P> Are you seeing any problems with this?  
 Should I never share common actions with rail worries?   
 
  backend.rb  )  You  Concerns  can create a file in the directory (such as your module:   backend.rb  )  
 and here is your code: < / P> 
  Module Backend Df Show Answer- do do | Format | Format.xls {set_excel_headers "# {controller_name.classify} _ # {params [: id]} _ # {time.now.to_i.to_s} .xls"} end and end  
 
 Then you add to your controller: 
 
  expansion backend

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