Sonata\BasketBundle\Controller\BasketController::addProductAction PHP Method

    public function addProductAction()
    {
        $request = $this->get('request');
        $params = $request->get('add_basket');
        if ($request->getMethod() != 'POST') {
            throw new MethodNotAllowedException(array('POST'));
        }
        // retrieve the product
        $product = $this->get('sonata.product.set.manager')->findOneBy(array('id' => $params['productId']));
        if (!$product) {
            throw new NotFoundHttpException(sprintf('Unable to find the product with id=%d', $params['productId']));
        }
        // retrieve the custom provider for the product type
        $provider = $this->get('sonata.product.pool')->getProvider($product);
        $formBuilder = $this->get('form.factory')->createNamedBuilder('add_basket', 'form', null, array('data_class' => $this->container->getParameter('sonata.basket.basket_element.class'), 'csrf_protection' => false));
        $provider->defineAddBasketForm($product, $formBuilder);
        // load and bind the form
        $form = $formBuilder->getForm();
        $form->bind($request);
        // if the form is valid add the product to the basket
        if ($form->isValid()) {
            $basket = $this->get('sonata.basket');
            $basketElement = $form->getData();
            $quantity = $basketElement->getQuantity();
            $currency = $this->get('sonata.basket')->getCurrency();
            $price = $provider->calculatePrice($product, $currency, true, $quantity);
            if ($basket->hasProduct($product)) {
                $basketElement = $provider->basketMergeProduct($basket, $product, $basketElement);
            } else {
                $basketElement = $provider->basketAddProduct($basket, $product, $basketElement);
            }
            $this->get('sonata.basket.factory')->save($basket);
            if ($request->isXmlHttpRequest() && $provider->getOption('product_add_modal')) {
                return $this->render('SonataBasketBundle:Basket:add_product_popin.html.twig', array('basketElement' => $basketElement, 'locale' => $basket->getLocale(), 'product' => $product, 'price' => $price, 'currency' => $currency, 'quantity' => $quantity, 'provider' => $provider));
            }
            return new RedirectResponse($this->generateUrl('sonata_basket_index'));
        }
        // an error occur, forward the request to the view
        return $this->forward('SonataProductBundle:Product:view', array('productId' => $product, 'slug' => $product->getSlug()));
    }