Rails - Jun 2006 - Validating numericality based on related attribute value?

I have a price attribute in my model which I need to validate as a
positive number if the attribute price_terms.requires_value is equal to
''Y'', otherwise price can be blank or zero.  Price_terms is a
select list
which my model table belongs_to.

How do I do this? - I tried doing this:

validates_numericality_of :price, :if =>
self.price_term.requires_value.upcase == ''Y''

But that doesn''t work...

Thanks in advance,

Matt.

Try this:

validates_numericality_of :price, :if => Proc.new { |r|
r.price_term.requires_value.upcase == ''Y'' }

-Jonathan.

On 6/8/06, Matthew Law <matt@matthewlaw.plus.com>
wrote:
> I have a price attribute in my model which I need to validate as a
> positive number if the attribute price_terms.requires_value is equal to
> ''Y'', otherwise price can be blank or zero.  Price_terms
is a select list
> which my model table belongs_to.
>
> How do I do this? - I tried doing this:
>
> validates_numericality_of :price, :if =>
> self.price_term.requires_value.upcase == ''Y''
>
> But that doesn''t work...
>
> Thanks in advance,
>
> Matt.