Did you look at validates_associated

http://api.rubyonrails.org/classes/ActiveRecord/Validations/ClassMethods.html#M002171

Darian Shimy
--
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On Fri, Nov 20, 2009 at 6:33 AM, Todd A. Jacobs
<[email protected]> wrote:
> I am trying to set up a validation in a model to ensure that a record
> can't be saved unless the foreign key it belongs_to is a valid record.
> My model says:
>
>    class Admin < ActiveRecord::Base
>        validates_presence_of :user_id
>        validates_numericality_of :user_id
>        validates_uniqueness_of :user_id
>        validates_associated :user
>
>        belongs_to :user
>
>    end
>
> but I can still create an admin record even if the associated user
> record doesn't exist. I tried creating a custom validator, too, but I
> couldn't test User.find(@user_id) from within the model.
>
> How can I check for this at the model level?
>
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>        -- Doctor Who, "Destiny of the Daleks"
>
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