On 14 Lis, 23:20, Nagy Károly <[email protected]> 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
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