Django query annotation with boolean field

I eventually found a way to do this using django 1.8’s new conditional expressions:

from django.db.models import Case, When, Value, IntegerField
q = (
    Product.objects
           .filter(...)
           .annotate(image_count=Count('images'))
           .annotate(
               have_images=Case(
                   When(image_count__gt=0,
                        then=Value(1)),
                   default=Value(0),
                   output_field=IntegerField()))
           .order_by('-have_images')
)

And that’s how I finally found incentive to upgrade to 1.8 from 1.7.