/**
* Returns an array containing, for each field, the arary key used for that
* field in self::$_fields.
*
* @return array
*/
static function &fieldKeys()
{
if (!(self::$_fieldKeys)) {
self::$_fieldKeys = array(
'id' => 'duration_id',
'start_date' => 'start_date',
'end_date' => 'end_date'
);
}
return self::$_fieldKeys;
}
