On 24 Mar 18:36, Guillem Barba Domingo wrote:
> El 24/03/2014 14:51, "Cédric Krier" <cedric.kr...@b2ck.com> va escriure:
> >
> > On 24 Mar 08:51, Guillem Barba Domingo wrote:
> > > You can achieve what you want with a UNIQUE sql_constraint and with
> _order
> > > property of model.
> >
> > UNIQUE constraints should always avoided if possible.
> 
> Why?

Because it is a constraint and each time you add a constraint you reduce
the possibilities for the user.

-- 
Cédric Krier - B2CK SPRL
Email/Jabber: cedric.kr...@b2ck.com
Tel: +32 472 54 46 59
Website: http://www.b2ck.com/

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