Kohana 3.1 ORM: How to implement a “unique” validation rule?

As far as I know there is no universal "unique" (or "is_unique") rule of Validation class. That's probably because of not regular nature of this kind of check.

In Kohana 3.2 ORM has a unique() method that does the check, I'm not sure if it exists in 3.1, but it should.

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