In Rails, How do I validates_uniqueness_of :field with a scope of last 6 months

In Rails, How do I validates_uniqueness_of :field with a scope of last 6
months



1.Ruby on Rails 3.0 Release Notes — Ruby on Rails Guides

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5.training.gov.au - Home page

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6.Riding Rails: Releases - Ruby on Rails

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8.Tony Finch - LiveJournal

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9.Heier's Custom Ruger 10/22s

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Description:Ruby on Rails Tutorial: Learn Rails by Example by Michael Hartl