ruby on rails - Carrierwave gem is not working in Redmine v 2.x Plugin -

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I single ???? Using carrier wave gem in a redmine plugin. But it is not working because it works in a simple rail app. For example, in my uploader category, there is a file_uploader.rb file in my uploaders directory that contains the following code. 

  class FileUploader & lt; CarrierWave :: Uploader :: Base Storage: file def store_dir "boxelements / # {model.class.to_s.underscore} / # {model.id} / # {mounted_as}" and end   
  
 
 
 Please take the uploaders into the main app directory of redmine.

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