Rails - Sep 2009 - How to validate_uniqueness_of the joint of two attributes?

Hi,

I have a form that asks users to put in their :first_name and :last_name.
How do I validate that their full_name (first_name + last_name) is unique?

Thanks!

Nguyen Anh Hung
Assistant Project Manager/ Consultant/ Business Analyst
Tech Propulsion Labs
Mobile: +84987 005 477
Twitter: http://www.twitter.com/anhhung
Blog:    http://www.fresco20.com
Skype: anhhung.n | Yahoo: hero.tuxer | Gtalk: anhhung

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You can use :scope
   validates_uniqueness_of :first_name, :scope => :last_name
If your database is huge, indexing last_name will help. Read more here:
http://api.rubyonrails.org/classes/ActiveRecord/Validations/ClassMethods.html

Thanks,
Abhinav
--
अभिनव
http://twitter.com/abhinav



On Tue, Sep 8, 2009 at 9:59 AM, Anh Hung Nguyen
<anhhung-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> Hi,
>
> I have a form that asks users to put in their :first_name and :last_name.
How do I validate that their full_name (first_name + last_name) is
unique?
>
> Thanks!
>
> Nguyen Anh Hung
> Assistant Project Manager/ Consultant/ Business Analyst
> Tech Propulsion Labs
> Mobile: +84987 005 477
> Twitter: http://www.twitter.com/anhhung
> Blog:    http://www.fresco20.com
> Skype: anhhung.n | Yahoo: hero.tuxer | Gtalk: anhhung
>
>
> >
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