Hi Jason,
On Monday 22 February 2010 09:57:18 Jason wrote:
> If I already had a QuerySet of Article named articles, how to get a
> QuerySet of Publication by these articles,
You can use field lookup operator `in` like this:
>>> Publication.objects.filter(
>>> article_set__id__in = article_qs.values_list('id', flat=True))
Maybe the ORM even accepts article_set__in = article_qs, but I haven't tried.
> and count the articles by
> the Publication?
>>> article_qs.annotate(Count('publications'))
See http://docs.djangoproject.com/en/dev/ref/models/querysets/
Hope this helps.
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