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How to get a simple product id from configurable in checkout order summary in magento 2

image is https://prnt.sc/nsnh7y

code:

 <?php
namespace CmPreorderPluginCheckoutModel;

use MagentoCheckoutModelSession as CheckoutSession;
use MagentoCatalogModelProductRepository as ProductRepository;
use MagentoCatalogInventoryModelStockStockItemRepository;

class DefaultConfigProvider extends MagentoFrameworkModelAbstractModel

 protected $checkoutSession;

 protected $stockItem;

 protected $_productRepository;

 private $_objectManager;



 public function __construct(
 CheckoutSession $checkoutSession,
 ProductRepository $productRepository,
 MagentoCatalogInventoryModelStockStockItemRepository $stockItem,
 MagentoFrameworkObjectManagerInterface $objectmanager
 ) 
 $this->checkoutSession = $checkoutSession;
 $this->_productRepository = $productRepository;
 $this->stockItem = $stockItem;
 $this->_objectManager = $objectmanager;

 

 public function afterGetConfig(
 MagentoCheckoutModelDefaultConfigProvider $subject, 
 array $result
 ) 
 $items = $result['totalsData']['items'];
 foreach ($items as $index => $item) 
 $quoteItem = $this->checkoutSession->getQuote()->getItemById($item['item_id']);
 $product = $this->_productRepository->getById($quoteItem->getProduct()->getId());

 $productId = $product->getId();
 $stock = $this->stockItem->get($productId);
 /* $preorder_note = $stock->getData('preorder_note'); */
 $result['quoteItemData'][$index]['preorder_note'] =$productId;
 
 return $result;
 

Try following way:

<?php
namespace SRMagentoCommunityPluginCheckoutModel;

use MagentoCheckoutModelSession as CheckoutSession;
use MagentoCatalogModelProductRepository as ProductRepository;
use MagentoCatalogInventoryModelStockStockItemRepository;

class DefaultConfigProvider

 /**
 * @var CheckoutSession
 */
 protected $checkoutSession;

 /**
 * @var StockItemRepository
 */
 protected $stockItem;

 /**
 * @var ProductRepository
 */
 protected $productRepository;

 /**
 * DefaultConfigProvider constructor.
 * @param CheckoutSession $checkoutSession
 * @param ProductRepository $productRepository
 * @param StockItemRepository $stockItem
 */
 public function __construct(
 CheckoutSession $checkoutSession,
 ProductRepository $productRepository,
 StockItemRepository $stockItem
 ) 
 $this->checkoutSession = $checkoutSession;
 $this->productRepository = $productRepository;
 $this->stockItem = $stockItem;
 

 public function afterGetConfig(
 MagentoCheckoutModelDefaultConfigProvider $subject,
 array $result
 ) 

 /** @var MagentoQuoteModelQuote $quote */
 $quote = $this->checkoutSession->getQuote();
 $quoteItemsArray = [];
 /** @var MagentoQuoteModelQuoteItem $item */
 foreach ($quote->getAllItems() as $item) 
 if ($item->getParentItemId()) 
 $quoteItemsArray[$item->getParentItemId()] = $item->getProductId();
 
 

 $items = $result['totalsData']['items'];
 foreach ($items as $index => $item) 
 if (isset($quoteItemsArray[$item['item_id']])) 
 $item['child_product_id'] = $quoteItemsArray[$item['item_id']];
 $result['totalsData']['items'][$index] = $item;
 
 

 return $result;