Myaste

Armoire:

<?php
class Armoire extends AppModel {


    public $hasMany = array(
        'Etage' => array(
            'className' => 'Etage'

        )
    );


}

?>

Etage :

<?php
class Etage extends AppModel {
    public $belongsTo = array(
        'Armoire' => array(
            'className' => 'Armoire',
            'foreignKey' => 'armoire_id'
        )
    );

    public $hasMany = array(
        'Livre' => array(
            'className' => 'Livre'

        )
    );


}

?>

Livre:

<?php
class Livre extends AppModel {

    public $belongsTo = array(
        'Etage' => array(
            'className' => 'Etage',
            'foreignKey' => 'etage_id'
        )
    );




}

?>