/**
  * Validates all modified columns of given Agent object.
  * If parameter $columns is either a single column name or an array of column names
  * than only those columns are validated.
  *
  * NOTICE: This does not apply to primary or foreign keys for now.
  *
  * @param      Agent $obj The object to validate.
  * @param      mixed $cols Column name or array of column names.
  *
  * @return     mixed TRUE if all columns are valid or the error message of the first invalid column.
  */
 public static function doValidate(Agent $obj, $cols = null)
 {
     $columns = array();
     if ($cols) {
         $dbMap = Propel::getDatabaseMap(AgentPeer::DATABASE_NAME);
         $tableMap = $dbMap->getTable(AgentPeer::TABLE_NAME);
         if (!is_array($cols)) {
             $cols = array($cols);
         }
         foreach ($cols as $colName) {
             if ($tableMap->containsColumn($colName)) {
                 $get = 'get' . $tableMap->getColumn($colName)->getPhpName();
                 $columns[$colName] = $obj->{$get}();
             }
         }
     } else {
     }
     $res = BasePeer::doValidate(AgentPeer::DATABASE_NAME, AgentPeer::TABLE_NAME, $columns);
     if ($res !== true) {
         $request = sfContext::getInstance()->getRequest();
         foreach ($res as $failed) {
             $col = AgentPeer::translateFieldname($failed->getColumn(), BasePeer::TYPE_COLNAME, BasePeer::TYPE_PHPNAME);
             $request->setError($col, $failed->getMessage());
         }
     }
     return $res;
 }