[Answered ]-Remove empty objects from the Django query results

I prefer to set related_name explicitly:

class coupons(models.Model):
    # ...
    couponStore = models.ForeignKey(stores, on_delete=models.PROTECT,
                                    related_name='coupons')
    # ...

Then stores, than have coupons:

stores.objects.exclude(coupons=None)