Suppose you have a Widget with a lock_version column.

If you try to do widget.previous_version.save!, you'll get a ActiveRecord::StaleObjectError.

I'm not sure how to override this. Ideally what should happen is that the newly reified object should have the same staleness / lock properties as the original object, so that if widget is OK to save then widget.previous_version should be too (since it hasn't changed out from under you).

Any ideas for how to implement this?