Rails - Apr 2006 - validates_numericality_of, :allow_nil => true?

Is there a way to use validates_numericality_of and still allow null 
values?

I have a model with some optional values that can be nil, but if
they''re
present, they must be numbers.  Will I need to construct a custom 
valiation for this, or is there some method built in?  Seems like it 
would be a common enough need.

Jeff

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Jeff Coleman wrote:
> Is there a way to use validates_numericality_of and still allow null 
> values?
:allow_nil => true

-- 

Ray

Ray Baxter wrote:
> Jeff Coleman wrote:
>> Is there a way to use validates_numericality_of and still allow null 
>> values?
> 
> :allow_nil => true
So I see my own post and yours have :allow_nil => true in the title, so 
maybe I misunderstood the question.

class Song < ActiveRecord::Base
   validates_numericality_of :length_in_seconds, :allow_nil => true
...
end

Details here: http://tinyurl.com/fnl3e

-- 

Ray

This may not be at all relevent to your problem, but the way I understand
it, ''nil'' and ''null'' are not the same thing.

hth
Bill
----- Original Message -----
From: "Ray Baxter" <ray@warmroom.com>
To: <rails@lists.rubyonrails.org>
Sent: 2006-04-03 4:22 PM
Subject: [Rails] Re: validates_numericality_of, :allow_nil => true?

> Ray Baxter wrote:
> > Jeff Coleman wrote:
> >> Is there a way to use validates_numericality_of and still allow
null
> >> values?
> >
> > :allow_nil => true
>
> So I see my own post and yours have :allow_nil => true in the title, so
> maybe I misunderstood the question.
>
> class Song < ActiveRecord::Base
>    validates_numericality_of :length_in_seconds, :allow_nil => true
> ...
> end
>
> Details here: http://tinyurl.com/fnl3e
>
> --
>
> Ray
>
>
>
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails

Jeff Coleman wrote:
> Is there a way to use validates_numericality_of and still allow null 
> values?
> 
> I have a model with some optional values that can be nil, but if
they''re
> present, they must be numbers.  Will I need to construct a custom 
> valiation for this, or is there some method built in?  Seems like it 
> would be a common enough need.
> 
> Jeff
That will teach me to post without trying it.  :allow_nil wasn''t listed
in the attributes for validates_numericality_of in Agile Web Dev, so I 
just assumed and posted prematurely.  It works fine.

Jeff

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