Rails - Jul 2009 - has_many relationship - specify how quantity (how many)

Hi,

Is there any way to specify a a validation rule or something for the
"has_many'' relationship so that it would count the related
objects?

For e.g. I want my Foo object to have maximum of 5 Bar objects in
has_many relationship.

M.
-- 
Posted via http://www.ruby-forum.com/.

I suppose you could write a custom validator to ensure that no more than 5
child objects exist.

On Sun, Jul 5, 2009 at 5:12 PM, Michal Burak <
rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
>
> Hi,
>
> Is there any way to specify a a validation rule or something for the
> "has_many'' relationship so that it would count the related
objects?
>
> For e.g. I want my Foo object to have maximum of 5 Bar objects in
> has_many relationship.
>
> M.
> --
> Posted via http://www.ruby-forum.com/.
>
> >
>
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validates :bar_limit

def bar_limit
  ...
end

-eric

On Jul 5, 2:12 pm, Michal Burak
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> Hi,
>
> Is there any way to specify a a validation rule or something for the
> "has_many'' relationship so that it would count the related
objects?
>
> For e.g. I want my Foo object to have maximum of 5 Bar objects in
> has_many relationship.
>
> M.
> --
> Posted viahttp://www.ruby-forum.com/.