UpdateItemOptions.php

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<?php
namespace Magento\Wishlist\Controller\Index;

use Magento\Catalog\Api\ProductRepositoryInterface;
use Magento\Customer\Model\Session;
use Magento\Framework\App\Action;
use Magento\Framework\Data\Form\FormKey\Validator;
use Magento\Framework\Exception\NoSuchEntityException;
use Magento\Framework\Controller\ResultFactory;
use Magento\Wishlist\Controller\WishlistProviderInterface;

class UpdateItemOptions extends \Magento\Wishlist\Controller\AbstractIndex
{
    protected $wishlistProvider;

    protected $_customerSession;

    protected $productRepository;

    protected $formKeyValidator;

    public function __construct(
        Action\Context $context,
        Session $customerSession,
        WishlistProviderInterface $wishlistProvider,
        ProductRepositoryInterface $productRepository,
        Validator $formKeyValidator
    ) {
        $this->_customerSession = $customerSession;
        $this->wishlistProvider = $wishlistProvider;
        $this->productRepository = $productRepository;
        $this->formKeyValidator = $formKeyValidator;
        parent::__construct($context);
    }

    public function execute()
    {
        $resultRedirect = $this->resultFactory->create(ResultFactory::TYPE_REDIRECT);
        if (!$this->formKeyValidator->validate($this->getRequest())) {
            return $resultRedirect->setPath('*/*/');
        }

        $productId = (int)$this->getRequest()->getParam('product');
        if (!$productId) {
            $resultRedirect->setPath('*/');
            return $resultRedirect;
        }

        try {
            $product = $this->productRepository->getById($productId);
        } catch (NoSuchEntityException $e) {
            $product = null;
        }

        if (!$product || !$product->isVisibleInCatalog()) {
            $this->messageManager->addError(__('We can\'t specify a product.'));
            $resultRedirect->setPath('*/');
            return $resultRedirect;
        }

        try {
            $id = (int)$this->getRequest()->getParam('id');
            /* @var \Magento\Wishlist\Model\Item */
            $item = $this->_objectManager->create(\Magento\Wishlist\Model\Item::class);
            $item->load($id);
            $wishlist = $this->wishlistProvider->getWishlist($item->getWishlistId());
            if (!$wishlist) {
                $resultRedirect->setPath('*/');
                return $resultRedirect;
            }

            $buyRequest = new \Magento\Framework\DataObject($this->getRequest()->getParams());

            $wishlist->updateItem($id, $buyRequest)->save();

            $this->_objectManager->get(\Magento\Wishlist\Helper\Data::class)->calculate();
            $this->_eventManager->dispatch(
                'wishlist_update_item',
                ['wishlist' => $wishlist, 'product' => $product, 'item' => $wishlist->getItem($id)]
            );

            $this->_objectManager->get(\Magento\Wishlist\Helper\Data::class)->calculate();

            $message = __('%1 has been updated in your Wish List.', $product->getName());
            $this->messageManager->addSuccess($message);
        } catch (\Magento\Framework\Exception\LocalizedException $e) {
            $this->messageManager->addError($e->getMessage());
        } catch (\Exception $e) {
            $this->messageManager->addError(__('We can\'t update your Wish List right now.'));
            $this->_objectManager->get(\Psr\Log\LoggerInterface::class)->critical($e);
        }
        $resultRedirect->setPath('*/*', ['wishlist_id' => $wishlist->getId()]);
        return $resultRedirect;
    }
}