__init__.py 文件源码

def _check_permission_clashing(custom, builtin, ctype):
    """
    Check that permissions for a model do not clash. Raises CommandError if
    there are duplicate permissions.
    """
    pool = set()
    builtin_codenames = set(p[0] for p in builtin)
    for codename, _name in custom:
        if codename in pool:
            raise CommandError(
                "The permission codename '%s' is duplicated for model '%s.%s'." %
                (codename, ctype.app_label, ctype.model_class().__name__))
        elif codename in builtin_codenames:
            raise CommandError(
                "The permission codename '%s' clashes with a builtin permission "
                "for model '%s.%s'." %
                (codename, ctype.app_label, ctype.model_class().__name__))
        pool.add(codename)