Rails - Jun 2006 - Write a Primary Key in Create

I do not want my one of my primary keys to be automaticlly 
incremented/created by the database.  I want to let the user enter it 
(unique still) so it can be accessed easily across the db.  I was 
wondering how i can do this (right now it won''t let me and passes a
null
to the pk creating an error)

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