One-To-One Unidirectionnal

Hi eveyrone,

I'm trying to make one to one unidirectionnal. The problem is, it does not work. Here is my entities:

class A extends CActiveRecord {

    public function relations() {
        return array(
            'logbook' => array(self::BELONGS_TO, 'Logbook', 'logbook_id'),
        );
    }

    public static function model($className = __CLASS__) {
        return parent::model($className);
    }
}

?>

class Logbook extends CActiveRecord {

    public static function model($className = __CLASS__) {
        return parent::model($className);
    }

}

I'm doing this:

$a = new A();
$b = new Logbook();

$a->logbook = $b;
$a->save();

But the foreign key 'logbook_id' is not set! And logbook has not been persisted.
Need some help please.