implements user name change requests

app/presenters/user_presenter.rb

@@ -130,4 +130,8 @@ class UserPresenter
       user.subscriptions.select {|x| x.is_public?}
     end
   end
+  
+  def previous_names
+    UserNameChangeRequest.approved.where("user_id = ?", user.id).map(&:original_name).join(", ")
+  end
 end