public static function delete_all_relations($gid)
{
// we need more info about the entity
$entity_info = TypedGroupEntity::load_for_group($gid, false);
$relation = array('subject_service' => 'internal', 'subject_type' => 'user', 'object_service' => 'typedGroup', 'object_type' => $entity_info['entity_type'], 'object_id' => $gid);
parent::delete_match($relation);
}
