cart_product = CartProduct.objects.filter(cart_id=cart[0].id)
class CartProduct(models.Model):
    cart_id = models.ForeignKey(Cart, null=True, blank=True, on_delete=models.CASCADE)
    quantity = models.IntegerField()
    product = models.ForeignKey(Product, on_delete=models.CASCADE)
    created_at = models.DateTimeField(auto_now_add=True)
    def 
str(self):
        return str(
self.product.id)
Как получить product id int