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Docs: AR Optimistic Locking, lock_version 

To address https://github.com/airblade/paper_trail/issues/163

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Jared Beck 2015-06-22 12:04:39 -04:00
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@ -416,8 +416,10 @@ Undeleting is just as simple:
>> widget.save # the widget lives!
```
In fact you could use PaperTrail to implement an undo system, though I haven't had the opportunity yet to do it myself. However [Ryan Bates has](http://railscasts.com/episodes/255-undo-with-paper-trail)!
You could even use PaperTrail to implement an undo system, [Ryan Bates has!][3]
If your model uses [optimistic locking][1] don't forget to [increment your
`lock_version`][2] before saving or you'll get a `StaleObjectError`.
## Navigating Versions
@ -1261,3 +1263,7 @@ Many thanks to:
Copyright (c) 2011 Andy Stewart (boss@airbladesoftware.com).
Released under the MIT licence.
[1]: http://api.rubyonrails.org/classes/ActiveRecord/Locking/Optimistic.html
[2]: https://github.com/airblade/paper_trail/issues/163
[3]: http://railscasts.com/episodes/255-undo-with-paper-trail