Greg Donald wrote:
> On Tue, Feb 16, 2010 at 7:04 PM, Greg Donald <gdon...@gmail.com> wrote:
>> You can easily detect a foreign key change with a filter in the model:
> Or even better:
> 
> http://www.railsapi.com/doc/rails-v2.3.5/classes/ActiveRecord/Callbacks.html
> 
> 
> 
> --
> Greg Donald
> destiney.com | gregdonald.com

The callback would only be triggered when you save though (or by 
validation which itself is triggered by saving).  It doesn't detect a 
simple attribute change without saving.
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