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

When you have to annotate existence with some filters, Sum annotation can be used. For example, following annotates if there are any GIFs in images:

Product.objects.filter(
).annotate(
    animated_images=Sum(
        Case(
             When(images__image_file__endswith='gif', then=Value(1)),
             default=Value(0),
             output_field=IntegerField()
        )
    )
)

This will actually count them, but any pythonic if product.animated_images: will work same as it was boolean.