doctrine2/tests_old/models/mmrGroupUser_C.php

<?php

class mmrGroupUser_C extends Doctrine_Entity 
{
    public static function initMetadata($class) 
    {
        $class->setColumn('user_id', 'string', 30, array('primary' => true));
        $class->setColumn('group_id', 'string', 30, array('primary' => true));
    }
}