public static function destroyByGroup($group_id)
	{
		$group_id = (is_array($group_id) ? $group_id : array($group_id));

		$blank = self::blank();

		$query = $blank->getQuery()
			->delete($blank->getTableName())
			->whereIn('group_id', $group_id);

		if (!$query->execute())
		{
			return false;
		}

		return true;
	}