Class _GetColumns

lib/sqlalchemy/orm/clsregistry.py:357–386

class _GetColumns:
    __slots__ = ("cls",)

    cls: Type[Any]

    def __init__(self, cls: Type[Any]):
        self.cls = cls

    def __getattr__(self, key: str) -> Any:
        mp = class_mapper(self.cls, configure=False)
        if mp:
            if key not in mp.all_orm_descriptors:
                raise AttributeError(
                    "Class %r does not have a mapped column named %r"
                    % (self.cls, key)
                )

            desc = mp.all_orm_descriptors[key]
            if desc.extension_type is interfaces.NotExtension.NOT_EXTENSION:
                assert isinstance(desc, attributes.QueryableAttribute)
                prop = desc.property
                if isinstance(prop, SynonymProperty):
                    key = prop.name
                elif not isinstance(prop, ColumnProperty):
                    raise exc.InvalidRequestError(
                        "Property %r is not an instance of"
                        " ColumnProperty (i.e. does not correspond"
                        " directly to a Column)." % key
                    )
        return getattr(self.cls, key)


inspection._inspects(_GetColumns)(