code: def query(self, session=None):
          '''Returns a new :class:`Query` for :attr:`Manager.model`.'''
          if session is None or session.router is not self.router:
              session = self.session()
          return session.query(self.modelf query(self, session=None):
          '''Returns a new :class:`Query` for :attr:`Manager.model`.'''
          if session is None or session.router is not self.router:
              session = self.session()
          return session.query(self.model)
docs: Returns a new :class:`Query` for :attr:`Manager.model`.