Rails - May 2006 - howto implement unchanged_attributes? when doing an update

I would appreciate if someone can let me know what would be the DRY way 
of implementing an "unchanged_attributes?" method when doing an
update,
just like in the example on page 
http://api.rubyonrails.com/classes/ActiveRecord/Validations.html
Is an around filter the way to go?
thx,
-Hakan


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