Method _flag_new_mapper

lib/sqlalchemy/orm/decl_api.py:1408–1414

(self, mapper: Mapper[Any])

        self._dependencies.add(registry)

    def _flag_new_mapper(self, mapper: Mapper[Any]) -> None:
        mapper._ready_for_configure = True
        if self._new_mappers:
            return

        for reg in self._recurse_with_dependents({self}):
            reg._new_mappers = True

    @classmethod
    def _recurse_with_dependents(