fix user dependent on papers

app/models/user.rb

@@ -57,6 +57,7 @@
 #
 class User < ApplicationRecord
   include WithAdminTheme
+  include WithAuthorship
   include WithAvatar
   include WithRegistrationContext
   include WithUniversity

app/models/user/with_authorship.rb

+module User::WithAuthorship
+  extend ActiveSupport::Concern
+
+  included do
+    has_many  :research_journal_papers,
+              class_name: "Research::Journal::Paper",
+              foreign_key: :updated_by_id,
+              dependent: :nullify
+  end
+end