how to subquery in queryset in django?

Question

how can i have a subquery in django\'s queryset? for example if i have:

select name, age from person, employee where person.id = employee.id and
employee.id          


        

Answer 1

The correct answer on your question is here https://docs.djangoproject.com/en/2.1/ref/models/expressions/#subquery-expressions

As an example:

>>> from django.db.models import OuterRef, Subquery
>>> newest = Comment.objects.filter(post=OuterRef('pk')).order_by('-created_at')
>>> Post.objects.annotate(newest_commenter_email=Subquery(newest.values('email')[:1]))