Method _getitem

lib/sqlalchemy/orm/path_registry.py:386–399

(
        self, entity: Any
    )

    is_unnatural = False

    def _getitem(
        self, entity: Any
    ) -> Union[_TokenRegistry, _AbstractEntityRegistry]:
        if entity in PathToken._intern:
            if TYPE_CHECKING:
                assert isinstance(entity, _StrPathToken)
            return _TokenRegistry(self, PathToken._intern[entity])
        else:
            try:
                return entity._path_registry  # type: ignore
            except AttributeError:
                raise IndexError(
                    f"invalid argument for RootRegistry.__getitem__: {entity}"
                )

    def _truncate_recursive(self) -> RootRegistry:
        return self