import eloquent


class DatabaseManager (eloquent.DatabaseManager):
    pass


class Model (eloquent.Model):
    def upsert (
            self,
            *args:  str,
    ) -> None:
        q = self.query ()
        for arg in args:
            q = q.where (arg, getattr (self, arg))
        row = q.first ()
        if row is not None:
            self.id = row.id
            self._Model__exists = True # pylint: disable = protected-access
        self.save ()

    @classmethod
    def with_ (
            cls,
            *relations: str,
    ) -> eloquent.QueryBuilder:
        q = cls.query ()
        for relation in relations:
            q = q._load_relation (relation)
        return q