Addgroup.php

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<?php
namespace Magento\Checkout\Controller\Cart;

use Magento\Checkout\Model\Cart as CustomerCart;
use Magento\Framework\Escaper;
use Magento\Framework\App\ObjectManager;
use Magento\Sales\Model\Order\Item;

class Addgroup extends \Magento\Checkout\Controller\Cart
{
    private $escaper;

    public function __construct(
        \Magento\Framework\App\Action\Context $context,
        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
        \Magento\Checkout\Model\Session $checkoutSession,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Framework\Data\Form\FormKey\Validator $formKeyValidator,
        CustomerCart $cart,
        Escaper $escaper = null
    ) {
        $this->escaper = $escaper ?: ObjectManager::getInstance()->get(\Magento\Framework\Escaper::class);
        parent::__construct($context, $scopeConfig, $checkoutSession, $storeManager, $formKeyValidator, $cart);
    }

    public function execute()
    {
        $orderItemIds = $this->getRequest()->getPost('order_items');
        if (is_array($orderItemIds)) {
            $itemsCollection = $this->_objectManager->create(\Magento\Sales\Model\Order\Item::class)
                ->getCollection()
                ->addIdFilter($orderItemIds)
                ->load();
            /* @var $itemsCollection \Magento\Sales\Model\ResourceModel\Order\Item\Collection */
            foreach ($itemsCollection as $item) {
                try {
                    $this->addOrderItem($item);
                } catch (\Magento\Framework\Exception\LocalizedException $e) {
                    if ($this->_checkoutSession->getUseNotice(true)) {
                        $this->messageManager->addNoticeMessage($e->getMessage());
                    } else {
                        $this->messageManager->addErrorMessage($e->getMessage());
                    }
                } catch (\Exception $e) {
                    $this->messageManager->addExceptionMessage(
                        $e,
                        __('We can\'t add this item to your shopping cart right now.')
                    );
                    $this->_objectManager->get(\Psr\Log\LoggerInterface::class)->critical($e);
                    return $this->_goBack();
                }
            }
            $this->cart->save();
        }
        return $this->_goBack();
    }

    private function addOrderItem(Item $item)
    {
        $session = $this->cart->getCustomerSession();
        if ($session->isLoggedIn()) {
            $orderCustomerId = $item->getOrder()->getCustomerId();
            $currentCustomerId = $session->getCustomer()->getId();
            if ($orderCustomerId == $currentCustomerId) {
                $this->cart->addOrderItem($item, 1);
                if (!$this->cart->getQuote()->getHasError()) {
                    $message = __(
                        'You added %1 to your shopping cart.',
                        $this->escaper->escapeHtml($item->getName())
                    );
                    $this->messageManager->addSuccessMessage($message);
                }
            }
        }
    }
}