gistfile1.txt

class DatabaseModelBase(models.ModelBase):¬
¬
    @classmethod¬
    def create(cls, **values):¬
        if 'id' not in values:¬
            values['id'] = cls.uuid_strategy(**values)¬
        if hasattr(cls, 'deleted') and 'deleted' not in values:¬
            values['deleted'] = False¬
        values['created'] = utils.utcnow()¬
        instance = cls(**values).save()¬
        if not instance.is_valid():¬
            raise exception.InvalidModelError(errors=instance.errors)¬
        return instance¬
¬
    @classmethod¬
    def uuid_strategy(cls, **values):¬
        return uuidutils.generate_uuid()¬
¬





................


class Action(dbmodels.DatabaseModelBase):¬
    """Defines an Instance Action."""¬
¬
    _data_fields = ['instance_uuid', 'updated_at', 'request_id', 'user_id',¬
                    'start_time', 'finish_time', 'message']¬
    _table_name = 'actions'¬
¬
    @classmethod¬
    def uuid_strategy(cls, **values):¬
        return None¬