On 14 Lis, 23:20, Nagy Károly <char...@rendszergazda.com> wrote:
> Please help me in orm level filtering many-to-many relations.
>
> I have to filter all "authors" who does not belongs to any "articles".
> Or the opposite of this, list of orphaned articles...
>
> I dont want to write sql in the model if possible.

How about something like this (should work, although I haven't checked
it):

Author.objects.annotate(article_num=Count('articles')).filter
(article_num=0)

- where articles=ManyToManyField('Article')

--
Tomasz Zieliński
http://pyconsultant.eu

--

You received this message because you are subscribed to the Google Groups 
"Django users" group.
To post to this group, send email to django-us...@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=.


Reply via email to