def _get_group_cached_perms(self):
        """
        Set group cache.
        """
        if not self.group:
            return {}
        perms = Permission.objects.filter(
            group=self.group,
        )
        group_permissions = {}
        for perm in perms:
            group_permissions[(
                perm.object_id,
                perm.content_type_id,
                perm.codename,
                perm.approved,
            )] = True
        return group_permissions
Set group cache.