Rails - Jul 2009 - Composite Primary Keys and validates_uniqueness_of

This question regards the Composite Primary Keys gem
(http://compositekeys.rubyforge.org/) :

Once I use set_primary_keys, should I also use

  validates_uniqueness_of to ensure that the composite primary key is
unique and

  attr_readonly to ensure that the attributes in the primary key would
not be overwritten?

Thanks.
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Learn by Doing wrote:
> This question regards the Composite Primary Keys gem
> (http://compositekeys.rubyforge.org/) :
> 
> Once I use set_primary_keys, should I also use
> 
>   validates_uniqueness_of to ensure that the composite primary key is
> unique 
You could, but remember that the DB will catch that in any case.
> and
> 
>   attr_readonly to ensure that the attributes in the primary key would
> not be overwritten?
Depends.  If you''re using a composite key, presumably it''s
built up from
domain data, so in many cases, you wouldn''t want to make it read-only.

What is your data like that you think you need this?
> 
> Thanks.
Best,
--
Marnen Laibow-Koser
http://www.marnen.org
marnen-sbuyVjPbboAdnm+yROfE0A@public.gmane.org
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