Ako na pracu s a v $session?Ak mozte,pomozte prosim

Ahojte.Pojdem hned na vec.Presiel som uz dokumentaciu a aj prispevky vo fore,ale zas sa neviem hnut.Ako na session?Moj BasePresenter :

<?php

namespace App\CustomerModule\Presenters;

use Nette,
	App\Model;
use Nette\Application\UI\Form as Form;


/**
 * Base presenter for all application presenters.
 */
abstract class BasePresenter extends Nette\Application\UI\Presenter
{
 /**
 * @var \App\Model\ItemsManager
 * @inject
 */
    public $itemsManager;
/**
 * @var \App\Model\SystemManager
 * @inject
 */
    public $systemManager;

 /**
 * @var \App\Model\UserManager
 * @inject
 */
    public $userManager;
/** @var Nette\Http\Session */
    private $session;
/** \Nette\Http\SessionSection */
    private $sessionSection;

    public function __construct(\Nette\Http\Session $session)
	{
                $this->session = $session;
		$this->sessionSection = $session->getSection('basket');
	}

    protected function startup()
    {
        parent::startup();
        $this->setLayout('customer');
        $user = $this->getUser();
        if (!$user->isInRole('customer'))
        {
            $user->logout(TRUE);
            $this->redirect(':Public:Sign:in');
        }
    }
    protected function beforeRender()
    {
        parent::beforeRender();

        $this->template->items = $this->itemsManager->getItems();
        $this->template->news = $this->itemsManager->news();
        $this->template->solds = $this->itemsManager->bestSold();
        $this->template->prices = $this->itemsManager->bestPrice();
        $this->template->theme = $this->systemManager->getDefaultTheme();
        $this->template->defaults = $this->systemManager->getDefaults();
        $this->template->user = $this->getUser();
    }

}

Ak som to spravne pochopil,mal by som ju mat nazvanu basket,ako s nou pracovat?
Skusal som toto :

protected function createComponentBuyItem()
    {
        $id = $this->getParameter('id');
        $form = new Form;
        $item = $this->itemsManager->getItem($id);
        $number = array();
        for($x=1 ; $x <= $item->quantity;$x++)
        {
            $number[$x] = $x;
        }
        $form->addSelect('quantity', 'Pocet kusu ', $number)
             ->setAttribute('class' , 'form_select');
        $form->addSubmit('send', 'Zakup')
             ->setAttribute('class' , 'form_button');
        $form->onSuccess[] = callback($this, 'buyItemSubmitted');
        $form->onSuccess[] = $this->buyItemSubmitted;
        return $form;
    }
    public function buyItemSubmitted($form) {
        $values = $form->getValues();
        $id = $this->getParameter('id');
        $basket->quantity = $values->quantity;
        //$this->itemsManager->buyItem($values->quantity , $id);
        $this->flashMessage('Zbozi zakoupeno');
        $this->redirect(':Customer:Homepage:default');
    }

No vyhodilo mi „Creating default object from empty value“.Navedie ma niekto prosim,ked tak aj s prihliadnutim na zaciatocnika…Dopredu dakujem