/**
* Class constructor
*
* @param resource &$db reference to the database handler
* @param integer project identifier
*/
function __construct(&$db, $tproject_id)
{
// you would think we could inherit the parent $db declaration
// but it fails to work without this.
$this->db =& $db;
// instantiate the parent constructor.
parent::__construct($this->db);
$this->cf_map = $this->get_linked_cfields($tproject_id);
}