MassAssignGroup.php

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<?php
namespace Magento\Customer\Controller\Adminhtml\Index;

use Magento\Framework\App\Action\HttpPostActionInterface as HttpPostActionInterface;
use Magento\Backend\App\Action\Context;
use Magento\Customer\Model\ResourceModel\Customer\CollectionFactory;
use Magento\Eav\Model\Entity\Collection\AbstractCollection;
use Magento\Ui\Component\MassAction\Filter;
use Magento\Customer\Api\CustomerRepositoryInterface;
use Magento\Framework\Controller\ResultFactory;

class MassAssignGroup extends AbstractMassAction implements HttpPostActionInterface
{
    protected $customerRepository;

    public function __construct(
        Context $context,
        Filter $filter,
        CollectionFactory $collectionFactory,
        CustomerRepositoryInterface $customerRepository
    ) {
        parent::__construct($context, $filter, $collectionFactory);
        $this->customerRepository = $customerRepository;
    }

    protected function massAction(AbstractCollection $collection)
    {
        $customersUpdated = 0;
        foreach ($collection->getAllIds() as $customerId) {
            // Verify customer exists
            $customer = $this->customerRepository->getById($customerId);
            $customer->setGroupId($this->getRequest()->getParam('group'));
            $this->customerRepository->save($customer);
            $customersUpdated++;
        }

        if ($customersUpdated) {
            $this->messageManager->addSuccess(__('A total of %1 record(s) were updated.', $customersUpdated));
        }
        $resultRedirect = $this->resultFactory->create(ResultFactory::TYPE_REDIRECT);
        $resultRedirect->setPath($this->getComponentRefererUrl());

        return $resultRedirect;
    }
}