Use prepend to correctly use the monketpatch's method

config/initializers/carrierwave_monkey_patch.rb

@@ -5,6 +5,7 @@ module CarrierWave
   module Storage
     class Fog < Abstract
       class File
+        module MonkeyPatch
           def read
             file_body = file.body
 
@@ -24,18 +25,21 @@ module CarrierWave
               new_file.copy_to(path)
             else
               fog_file = new_file.to_file
-            @content_type ||= new_file.content_type
-            @file = directory.files.create({
+              @content_type ||= new_file.content_type # rubocop:disable Gitlab/ModuleWithInstanceVariables
+              @file = directory.files.create({ # rubocop:disable Gitlab/ModuleWithInstanceVariables
                 :body         => fog_file ? fog_file : new_file.read, # rubocop:disable Gitlab/HashSyntax
-              :content_type => @content_type, # rubocop:disable Gitlab/HashSyntax
+                :content_type => @content_type, # rubocop:disable Gitlab/HashSyntax,Gitlab/ModuleWithInstanceVariables
                 :key          => path, # rubocop:disable Gitlab/HashSyntax
-              :public       => @uploader.fog_public # rubocop:disable Gitlab/HashSyntax
-            }.merge(@uploader.fog_attributes))
+                :public       => @uploader.fog_public # rubocop:disable Gitlab/HashSyntax,Gitlab/ModuleWithInstanceVariables
+              }.merge(@uploader.fog_attributes)) # rubocop:disable Gitlab/ModuleWithInstanceVariables
               fog_file.close if fog_file && !fog_file.closed?
             end
             true
           end
         end
+
+        prepend MonkeyPatch
+      end
     end
   end
 end