[Answered ]-Exclude objects having `is_deleted = True` in Django

You can always override the default object manager to exclude records by default:

class DeletedManager(models.Manager):
    def get_queryset(self):
        return super(DeletedManager, self).get_queryset().filter(is_deleted=False)


class YourModel(models.Model):
    . . .

    objects = DeletedManager()