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'))
Alex
--
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say it." --Voltaire
"The people's good is the highest law."--Cicero
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