在after save方法最后添加了一个puts

app/models/issue.rb

@@ -1532,6 +1532,7 @@ class Issue < ActiveRecord::Base
       self.updated_on = current_time_from_proper_timezone
       if new_record?
         self.created_on = updated_on
+        puts "after force_updated_on_change"
       end
     end
   end