Rails currently doesn't support the dirty methods for an attribute alias'.

i.e. if you setup an alias called title (alias_attribute :title, :name) then
title_changed? isn't defined.

Rich has written a simple patch with test so the dirty methods are defined
for attribute alias's ->
http://rails.lighthouseapp.com/projects/8994-ruby-on-rails/tickets/812 and
it's received a couple of +1's now.

Cheers,

Tim.

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