On Nov 10, 6:01 am, Malcolm Tredinnick <[EMAIL PROTECTED]>
wrote:
> On Fri, 2007-11-09 at 08:19 -0800, Xan wrote:
>
> > On Nov 9, 2:36 am, Malcolm Tredinnick <[EMAIL PROTECTED]>
> > wrote:
> > > On Thu, 2007-11-08 at 09:11 -0800, Xan wrote:
> > > > Hi,
>
> > > > I have these models:
>
> > > > class A(models.Model):
>
> > > > [...]
> > > > def __str__(self):
> > > > return "(%s, %s)" % (self.estudi, self.curs)
>
> > > > class Admin:
> > > > pass
>
> > > > and
>
> > > > class B(models.Model):
>
> > > > estudi_oferit = models.ManyToManyField('A', blank=True, null=True)
>
> > > > class Admin:
> > > > list_display = ('tipus', 'codi', 'nom', 'adreca',
> > > > 'localitat', 'cp',
> > > > 'zona_concurs', 'ordre_concurs', 'estudi_oferit')
>
> > > > and when I list B elements in admin mode, in puts me address memory of
> > > > objects instead of displaying field A as I define in __str__
>
> > > You have not defined __str__ on B, so this isn't entirely unexpected
> > > (although I am not completely sure what you're seeing, but anything is
> > > not unexpected here).
>
> > > Note that the estudi_oferit field is many-to-many, so it has no
> > > "natural" way to be represented as a string. After all, it could be
> > > referring to 10,000 objects at the other end. There's no way to display
> > > that naturally.
>
> > I'mt not agree with you: there is a natural way for displaying
> > "estudi_oferit": list all of estudi_oferit's that has one instance.
>
> Since it's a many-to-many relationship, there could be millions of
> related objects for a single B instance, so this would be a very poor
> default representation.
Yes, but I mean that it should be that way.
We could be restrict the number of objects displaying in admin mode
by:
list_display = ('tipus', 'codi', 'nom', 'adreca', 'localitat',
'cp', 'zona_concurs', 'ordre_concurs', 'estudi_oferit':30)
and admin mode only show almost 30 first objects of estudi_oferit?
It's the natural way for displaying it I think. For the problem of
millions of objects we could put a restriction of displaying in list.
It could be done?
> Django doesn't do that. All your other problems
> seem to stem from this assumption. Note that this is actually documented
> behaviour, too. You're expecting something to happen that we explicitly
> say won't happen (read the docs for list_display again). We also
> document how to emulate the behaviour if you really want it.
Were it's _exactly_ documented? I did not find it
Thanks in advance,
Xan.
>
> Malcolm
>
> --
> If at first you don't succeed, destroy all evidence that you
> tried.http://www.pointy-stick.com/blog/
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