Ruby on Rails

>> So you are just wanting uniqueness of www_link.href? Will not
>> validates_uniqueness_of in WwwLink class (backed up by a unique
>> constraint in the database of course) do the job? I think in this
>> case it will be the foo2.www_links.create that will fail.
>> Colin
> The constraint is on "owner" and "href", not "href" itself.
> I can have multiple links with the same href. But those cannot be with
> the same owner_id.

validates_uniqueness_of(:href, :scope => [:owner_type, :owner_id])

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