On Tue, Mar 24, 2009 at 4:26 PM, Konstantin S <ktechli...@gmail.com> wrote:
>
>
>
> On Mar 24, 11:13 pm, Alex Gaynor <alex.gay...@gmail.com> wrote:
> > On Tue, Mar 24, 2009 at 4:05 PM, Konstantin S <ktechli...@gmail.com>
> wrote:
> >
> > > Hello!
> >
> > > I have two unrelated models that have one common field.
> >
> > > class Media(models.Model):
> > > title = models.CharField(max_length=500)
> > > ...
> >
> > > class Link(models.Model):
> > > title = models.CharField(max_length=500)
> > > ...
> >
> > > Now I want to select those objects from the Media model that do not
> > > exist in the Link model if we compare them only by 'title' field. In
> > > raw SQL it looks like this:
> >
> > > select * from Media left join Link on Media.title=Link.title where
> > > Link.title is null;
> >
> > > Is it possible to make the same thing by Django ORM only ?
> >
> > So to be clear you want all items from Media for which there isn't a link
> > with that title, in the ORM that would look like:
> >
> > Media.objects.exclude(title__in=Link.objects.values('title'))
> >
>
> Yes, but I want to be sure that it uses JOIN syntax.
>
> >
>
It's not possible to do that using the ORM, you'll need to use some raw sql.
Alex
--
"I disapprove of what you say, but I will defend to the death your right to
say it." --Voltaire
"The people's good is the highest law."--Cicero
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Django users" group.
To post to this group, send email to django-users@googlegroups.com
To unsubscribe from this group, send email to
django-users+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/django-users?hl=en
-~----------~----~----~----~------~----~------~--~---
