Rails - Feb 2007 - Mutiple unique key(Compisitive unique)

Hi All..

I am new to ruby on rails.I want set the unquie on two fields.
Means in one model three fileds are there.
1.Id,
2.C-id
3.Q-id

I want set the unquie on C-Id,Q-Id combindely on the model validations

Can u give me advice?
I tryed with statemwnt validates_uniqueness_of [:c_id, :qid]
But it now giving the proper results

Regards,
Ramya

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