Disable Safe Query For Order_By

There is a third parameter, that disables escaping so you can use complex expressions for sorting, you can set it to FALSE to disable escaping.

PHP Code:

    /**
     * ORDER BY
     *
     * @param    string    $orderby
     * @param    string    $direction    ASC, DESC or RANDOM
     * @param    bool    $escape
     * @return    CI_DB_query_builder
     */
    public function order_by($orderby, $direction = '', $escape = NULL)