Ruby on Rails

class Foo < ActiveRecoed::Base
has_many :www_links, :as => :owner
end

class WwwLink < ActiveRecord::Base
belongs_to :owner, :polymorphic => true
attr_accessible :href
end

I want to ensure that each Foo instance does not have same links (href).

My first attempt would be to write validation in Foo that checks all its
www_links. But then I would also have to do it in WwwLink class. That
would not be DRY.

Any other ideas?

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