Rails - Jun 2006 - conditional validation

Hi how can I validate a field only if another field is set to a specific value?

I tried to use

validates_length_of :fieldname, :maximum => 100, :if =>
:otherfieldname == ''myvalue''

But doesn''t work

Thanks

Paolo

You can use blocks in your validations.

Try

validates_length_of :fieldname, :maximum => 100, :if => Proc.new{
|mymodel|
mymodel.otherfieldname == ''myvaule'' }



On 6/12/06, Paolo Negri <hungrylist@gmail.com>
wrote:
>
> Hi how can I validate a field only if another field is set to a specific
> value?
>
> I tried to use
>
> validates_length_of :fieldname, :maximum => 100, :if =>
> :otherfieldname == ''myvalue''
>
> But doesn''t work
>
> Thanks
>
> Paolo
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>
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Thanks Daniel

Of course this way it works.

Paolo

2006/6/12, Daniel N <has.sox@gmail.com>:
> You can use blocks in your validations.
>
> Try
>
> validates_length_of :fieldname, :maximum => 100, :if => Proc.new{
|mymodel|
> mymodel.otherfieldname == ''myvaule'' }
>
>
>
>
>  On 6/12/06, Paolo Negri <hungrylist@gmail.com> wrote:
> >
>  Hi how can I validate a field only if another field is set to a specific
> value?
>
> I tried to use
>
> validates_length_of :fieldname, :maximum => 100, :if =>
> :otherfieldname == ''myvalue''
>
> But doesn''t work
>
> Thanks
>
> Paolo