using paper trail, getting the difference with object_changes?

activerecord, ruby-on-rails, ruby-on-rails-3

Solution

You need to restart your server for paper trail to pick up the change

Problem

I am using paper trail with Rails 3.1 and would like to get a diff between models. It looks like this is supported by adding object_changes as a text column to versions. I have done this but the changeset is not being saved. Is there any other step that needs to be done?

Original source