Django query annotation with boolean field

Question

Let\'s say I have a Product model with products in a storefront, and a ProductImages table with images of the product, which can have zero or more im

Answer 1

As from Django 1.11 it is possible to use Exists. Example below comes from Exists documentation:

>>> from django.db.models import Exists, OuterRef
>>> from datetime import timedelta
>>> from django.utils import timezone
>>> one_day_ago = timezone.now() - timedelta(days=1)
>>> recent_comments = Comment.objects.filter(
...     post=OuterRef('pk'),
...     created_at__gte=one_day_ago,
... )
>>> Post.objects.annotate(recent_comment=Exists(recent_comments))