Use prepend to correctly use the monketpatch's method

config/initializers/carrierwave_monkey_patch.rb

@@ -5,36 +5,40 @@ module CarrierWave
   module Storage
     class Fog < Abstract
       class File
-        def read
-          file_body = file.body
+        module MonkeyPatch
+          def read
+            file_body = file.body
 
-          return if file_body.nil?
-          return file_body unless file_body.is_a?(::File)
+            return if file_body.nil?
+            return file_body unless file_body.is_a?(::File)
 
-          begin
-            file_body = ::File.open(file_body.path) if file_body.closed? # Reopen if it's closed
-            file_body.read
-          ensure
-            file_body.close
+            begin
+              file_body = ::File.open(file_body.path) if file_body.closed? # Reopen if it's closed
+              file_body.read
+            ensure
+              file_body.close
+            end
           end
-        end
 
-        def store(new_file)
-          if new_file.is_a?(self.class) # rubocop:disable Gitlab/LineBreakAroundConditionalBlock
-            new_file.copy_to(path)
-          else
-            fog_file = new_file.to_file
-            @content_type ||= new_file.content_type
-            @file = directory.files.create({
-              :body         => fog_file ? fog_file : new_file.read, # rubocop:disable Gitlab/HashSyntax
-              :content_type => @content_type, # rubocop:disable Gitlab/HashSyntax
-              :key          => path, # rubocop:disable Gitlab/HashSyntax
-              :public       => @uploader.fog_public # rubocop:disable Gitlab/HashSyntax
-            }.merge(@uploader.fog_attributes))
-            fog_file.close if fog_file && !fog_file.closed?
+          def store(new_file)
+            if new_file.is_a?(self.class) # rubocop:disable Gitlab/LineBreakAroundConditionalBlock
+              new_file.copy_to(path)
+            else
+              fog_file = new_file.to_file
+              @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,Gitlab/ModuleWithInstanceVariables
+                :key          => path, # rubocop:disable Gitlab/HashSyntax
+                :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
-          true
         end
+
+        prepend MonkeyPatch
       end
     end
   end