RefreshPath.php

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<?php
namespace Magento\Catalog\Controller\Adminhtml\Category;

use Magento\Framework\App\Action\HttpGetActionInterface as HttpGetActionInterface;

class RefreshPath extends \Magento\Catalog\Controller\Adminhtml\Category implements HttpGetActionInterface
{
    protected $resultJsonFactory;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Framework\Controller\Result\JsonFactory $resultJsonFactory
    ) {
        parent::__construct($context);
        $this->resultJsonFactory = $resultJsonFactory;
    }

    public function execute()
    {
        $categoryId = (int)$this->getRequest()->getParam('id');
        if ($categoryId) {
            $category = $this->_objectManager->create(\Magento\Catalog\Model\Category::class)->load($categoryId);

            $resultJson = $this->resultJsonFactory->create();
            return $resultJson->setData([
                'id' => $categoryId,
                'path' => $category->getPath(),
                'parentId' => $category->getParentId(),
            ]);
        }
    }
}