:allow_blank is in 2.0 AFAIK, so that should do what you want
On 11/28/07, Greg Willits <[EMAIL PROTECTED]> wrote:
>
> So, here's a case something didn't work as expected, and I'm wondering
> if a feature tweak is worth considering.
>
> If I use :allow_nil => TRUE, validation rules still complain if a form
> field is submitted empty (w/o using a presence_of rule).
>
> So...
>
> validates_format_of :first_name, :with => Is_human_name,
> :allow_nil => TRUE, :message => Is_not_human_name_msg
>
> Will complain if the field is submitted as empty. Now, empty doesn't
> conform to the regex I am using, but I was expecting that :allow_nil
> will cause the validation to be ignored when the value is empty.
>
> After thinking about it, I can see that params creates emptry strings
> which are not interpreted as nil for saving. That makes sense, and
> therefore I can see why Rails still validated my format rule.
>
> Ultimately what I was trying to do was have certain messages override
> the need for others.
>
> If I have this:
>
> validates_presence_of :first_name
>
> validates_format_of :first_name, :with => Is_human_name,
> :allow_nil => TRUE, :message => Is_not_human_name_msg
>
> And the field is submitted as empty, then the only error message I need
> to see is the one that says the field cannot be empty. I do not need to
> see the format_of error message, or another any subsequent rule failure
> that might apply.
>
> It was suggested that using an :if is the typical strategy for
> accomplishing that:
>
> :if => Proc.new { |model_name| model_name.first_name.length > 0 }
>
> That seems rather bulky (especially when repetitive), and I wonder if an
> :allow_empty => TRUE couldn't be used to provide the behavior I was
> expecting -- rules are ignored for *empty* fields, not just Nil ones.
>
> Or perhaps it is better named, :ignore_empty => TRUE
>
> Maybe this is too small a use case, but it sure reduces the :if bulk.
> Just a thought...
> --
> Posted via http://www.ruby-forum.com/.
>
> >
>
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