Rails - Jun 2006 - Using varchar() and/or concatented pks

Can someone please direct me to some documentation on how to use Active 
Record w/ alphabetic and/or concatenated primary keys?

Thanks.

Dennis Byrne
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
http://wrath.rubyonrails.org/pipermail/rails/attachments/20060626/b4788431/attachment-0001.html