private function uniqueSlug($bean, $property_name, $slug) {
		$other = \R::findOne($bean->getMeta('type'), $property_name . ' = ? ', [ $slug ] );
		if ($other) {
			if ($other->id == $bean->id) {
				return true;
			} else {
				return false;
			}
		} else {
			return true;
		}
	}