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RailsCasts #255 Undo with Paper Trail
Railscasts - 2011-02-28 - free
Undo and redo behavior is easy to add with a versioning gem such as Paper Trail. Learn how to add an undo link to any model's flash message.
Watch this screencastRailsCasts #177 Model Versioning
Railscasts - 2009-08-31 - free
If you need to keep track of a model's history of changes and switch between versions, consider using the vestal_versions gem like I show in this episode.
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