Hi all,
I have a question about reverse queries in ForeignKey relationships. Taking
the example given in
<http://www.djangoproject.com/documentation/models/many_to_one/>, I know that
I can filter the Reporter objects to get those who have associated Articles,
based on Article properties:
Reporter.objects.filter(article__headline__startswith='This')
I guess I can get all Reporters who have associated Articles by doing:
Reporter.objects.filter(article__isnull = False)
But, is there a way to get Reporters who have *no* associated Article? I tried
Reporter.objects.filter(article__isnull = True)
but it returns an empty list, since the article property does not exist for
those Reporters, and thus, it can't even be null.
The aim is to use this in a limit_choices_to option, to only allow selection
of 'free' Reporters in the admin interface (ie. Reporters who still do not
have written any article, they lazy guys).
TIA,
--
Kilian CAVALOTTI Administrateur réseaux et systèmes
UPMC / CNRS - LIP6 (C870)
8, rue du Capitaine Scott Tel. : 01 44 27 88 54
75015 Paris - France Fax. : 01 44 27 70 00
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