Estoy usando estas tres relaciones User, Movie y UsersWatchlist .. Donde users_watchlists contiene movie_id y user_id como atributos ... Tengo esta estructura

array(
'User' => array(
    'id' => '3'
),
'UsersWatchlist' => array(
    'UsersWatchlist' => array(
        (int) 0 => '3'
    )
)

)

public function watchlist($id = null) {
    $userid = '3';
    if (!$id && $userid != 3) {
        $this->Session->setFlash('Invalid Movie');
        $this->redirect($this->referer(array('action' => 'listing')));
    }
    $this->request->data['User']['User'][] = $userid;
    $this->request->data['Movie']['Movie'][] = $id;
    debug($this->request->data);
    if ($this->User->saveAll($this->request->data)) {
        debug("saved");
        $this->Session->setFlash('The movie has been added to your watchlist', 'admin/flash_success');
        //$this->redirect($this->referer(array('action' => 'listing')));
    } else {
        debug("saved bo");
        $this->Session->setFlash('The movie could not be added to your watchlist. Please, try again.', 'admin/flash_error');
        //$this->redirect($this->referer(array('action' => 'listing')));
    }  
}

Utilicé el método saveAll en el usuario pero no se está guardando. Por favor, dame una solución para guardar los datos.

En el modelo de película,

public $hasAndBelongsToMany = array('User' => array(
        'className' => 'User',
        'joinTable' => 'users_watchlists',
        'foreignKey' => 'movie_id',
        'associationForeignKey' => 'user_id',
        'unique' => 'keepExisting',
        'conditions' => '',
        'fields' => '',
        'order' => '',
        'limit' => '',
        'offset' => '',
        'finderQuery' => '',
        'deleteQuery' => '',
        'insertQuery' => ''
    )
);

En el modelo de usuario,

public $hasAndBelongsToMany = array(
   'Movie' => array(
        'className' => 'Movie',
        'joinTable' => 'users_watchlists',
        'foreignKey' => 'user_id',
        'associationForeignKey' => 'movie_id',
        'unique' => 'keepExisting',
        'conditions' => '',
        'fields' => '',
        'order' => '',
        'limit' => '',
        'offset' => '',
        'finderQuery' => '',
        'deleteQuery' => '',
        'insertQuery' => ''
    )

);

En el modelo UsersWatchlist,

public $belongsTo = array(
    'User' => array(
        'className' => 'User',
        'foreignKey' => 'user_id',
        'conditions' => '',
        'fields' => '',
        'order' => ''
    ),
    'Movie' => array(
        'className' => 'Movie',
        'foreignKey' => 'movie_id',
        'conditions' => '',
        'fields' => '',
        'order' => ''
    )
);