MassDelete.php

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<?php
namespace Magento\Search\Controller\Adminhtml\Synonyms;

class MassDelete extends \Magento\Backend\App\Action
{
    const ADMIN_RESOURCE = 'Magento_Search::synonyms';

    private $filter;

    private $collectionFactory;

    private $synGroupRepository;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Ui\Component\MassAction\Filter $filter,
        \Magento\Search\Model\ResourceModel\SynonymGroup\CollectionFactory $collectionFactory,
        \Magento\Search\Api\SynonymGroupRepositoryInterface $synGroupRepository
    ) {
        $this->filter = $filter;
        $this->collectionFactory = $collectionFactory;
        $this->synGroupRepository = $synGroupRepository;
        parent::__construct($context);
    }

    public function execute()
    {
        $collection = $this->filter->getCollection($this->collectionFactory->create());
        $collectionSize = $collection->getSize();

        $deletedItems = 0;
        foreach ($collection as $synonymGroup) {
            try {
                $this->synGroupRepository->delete($synonymGroup);
                $deletedItems++;
            } catch (\Exception $e) {
                $this->messageManager->addErrorMessage($e->getMessage());
            }
        }
        if ($deletedItems != 0) {
            if ($collectionSize != $deletedItems) {
                $this->messageManager->addErrorMessage(
                    __('Failed to delete %1 synonym group(s).', $collectionSize - $deletedItems)
                );
            }

            $this->messageManager->addSuccessMessage(
                __('A total of %1 synonym group(s) have been deleted.', $deletedItems)
            );
        }
        $resultRedirect = $this->resultFactory->create(\Magento\Framework\Controller\ResultFactory::TYPE_REDIRECT);
        return $resultRedirect->setPath('*/*/');
    }
}