$result = $query->fetchArray();
$mishmember = $result['Mishmember'];
unset($result['Mishmember']);
$user = array_merge($result, $mishmember);
Mishmember:
inheritance:
type: simple (or column_aggregation)
extends: sfGuardUser
columns:
myfield:
type:integer
$mishmember = Doctrine::getTable('Mishmember')->find(1);
echo $mishmember->myfield;