/**
* 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::$_fieldKeys = array('id' => 'id', 'participant_id' => 'participant_id', 'contribution_id' => 'contribution_id');
}
return self::$_fieldKeys;
}
