On Mon, Feb 2, 2009 at 10:11 PM, Markus T. <oberroc...@googlemail.com> wrote:
>
> Hi,
>
> I have two simple models:
>
> class Country(models.Model):
> name = models.CharField(_("Name"), max_length=50,
> unique=True)
>
> class Profile(models.Model):
> name = models.CharField(_("Name"), max_length=50,
> unique=True)
> country = models.ForeignKey(Country)
>
>
> If I want to create a list of all countries that are actually
> referenced (i.e. used by at least one Profile entry), how would I code
> that in Django?
If you need country_id/country_name:
>>> Profile.objects.values('country__id',
>>> 'country__name').select_related('country').distinct()
[{'country__name': u'Country1', 'country__id': 1}, {'country__name':
u'Country3', 'country__id': 3}]
Which run this query:
>>> Profile.objects.values('country__id',
>>> 'country__name').select_related('country').distinct().query.as_sql()
('SELECT DISTINCT "b_profile"."country_id", "b_country"."name" FROM
"b_profile" INNER JOIN "b_country" ON ("b_profile"."country_id" =
"b_country"."id")', ())
M.
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