In a Rails 2.x validation to check if the name of some model is unique
within a some category, I would use:
`validates_uniqueness_of :name, :scope => :category_id`
In Rails 3, this is replaced with:
`validates :name, :uniqueness => true`
However, I can''t seem to find a method of defining the
uniqueness''
scope. Am I missing something?
Thanks,
Angelo
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