bugfixes, policies, errors now have a link to the submissions

app/models/comment.rb

@@ -1,6 +1,7 @@
 class Comment < ActiveRecord::Base
   # inherit the creation module: encapsulates that this is a polymorphic user, offers some aliases and makes sure that all necessary attributes are set.
   include Creation
+  attr_accessor :username
 
   belongs_to :file, class: CodeOcean::File
 end