async def test_update_virtual(self):
    tour = (await Tournament.create(name='moo'))
    obj0 = (await MinRelation.create(tournament=tour))
    with self.assertRaisesRegex(FieldError, 'is virtual and can not be updated'):
        (await MinRelation.filter(id=obj0.id).update(participants=[]))
async def test_update_virtual(self):
    tour = (await Tournament.create(name='moo'))
    obj0 = (await MinRelation.create(tournament=tour))
    with self.assertRaisesRegex(FieldError, 'is virtual and can not be updated'):
        (await MinRelation.filter(id=obj0.id).update(participants=[]))