Rails - Jul 2009 - validates_uniqueness_of and attr_readonly

I notice that I always want to prevent the unique key of a table from
being changed.  Does that mean I always have to have attr_readonly right
after validates_uniqueness_of ?  Is there a single function that
replaces both of these but has the same affect?

Thanks.


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Developing with Rails 2.3.2; Ruby 1.8.7 (2009-04-08 patchlevel 160)
[powerpc-darwin9]
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