it depends on the specific callback in question. the list of available
callbacks can be found here: 
http://api.rubyonrails.org/classes/ActiveRecord/Callbacks.html

On Jan 24, 11:43 pm, Greg Hauptmann <[email protected]>
wrote:
> Hi,
> Re Rails observers, 
> (i.e.http://api.rubyonrails.org/classes/ActiveRecord/Observer.html), can 
> anyone
> clarify:
>
> Question - Does the call back for a registered observer occur AFTER or
> BEFORE the database transaction has completed?  (e.g. if I issued a manual
> rollback call in an observer callback method would it work or be too late to
> trigger the rollback)
>
> --
> Greghttp://blog.gregnet.org/
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