Function _dive_for_cls_manager

lib/sqlalchemy/orm/decl_base.py:218–229

(cls: Type[_O])

def _dive_for_cls_manager(cls: Type[_O]) -> Optional[ClassManager[_O]]:
    # because the class manager registration is pluggable,
    # we need to do the search for every class in the hierarchy,
    # rather than just a simple "cls._sa_class_manager"

    for base in cls.__mro__:
        manager: Optional[ClassManager[_O]] = attributes.opt_manager_of_class(
            base
        )
        if manager:
            return manager
    return None


@util.preload_module("sqlalchemy.orm.decl_api")