in rails, how to validate a fields which is NOT uniqueness?

Posted by siulamvictor on Stack Overflow See other posts from Stack Overflow or by siulamvictor
Published on 2010-05-27T06:32:37Z Indexed on 2010/05/27 6:41 UTC
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Filed under:

ruby-on-rails

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validation

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validates-uniqueness-of

can i have a validation which do exactly opposite to validates_uniqueness_of? i.e. i would like to show a error message when the user input is NOT exist in database.

thanks all. :)

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