rubyonrailsin

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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