Rails - Feb 2006 - Validation relative to other attributes

I have an object O with two ''collections''.  The minimum size
for B is A.length
+ 1.

Also, B has to be a proper subset of A.

What is the correct way to validate B?

David

In a custom validate method.

http://rails.rubyonrails.com/classes/ActiveRecord/ 
Validations.html#M000671

-- 
-- Tom Mornini

On Feb 19, 2006, at 8:59 AM, David Corbin wrote:
> I have an object O with two ''collections''.  The minimum
size for B
> is A.length
> + 1.
>
> Also, B has to be a proper subset of A.
>
> What is the correct way to validate B?
>
> David
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