Rails - Sep 2006 - Validates Presence of Child Object

Hi Folks,

Is there a validation in rails that works on child objects that are
declared as associations.

eg: I have an Order class and a LineItem class, where Order has_many
:line_items.  Is there a validation that would allow me to ensure that
an order is only valid when it has at least on line item?

Thanks,
Scott


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On 9/22/06, sbellware <sbellware-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> Is there a validation in rails that works on child objects that are
> declared as associations.
>
> eg: I have an Order class and a LineItem class, where Order has_many
> :line_items.  Is there a validation that would allow me to ensure that
> an order is only valid when it has at least on line item?

Sure, validates_size_of :line_items, :minimum => 1

jeremy


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