#28573:wrong thumbnail - regardless of the storeConfig value configurable_thumbnail_source which points to the child or parent while rendering cart the configured_variant will always show the child

Author: sasha19957099

app/code/Magento/ConfigurableProductGraphQl/Plugin/Product/Configuration/Item/ItemResolver.php

@@ -0,0 +1,37 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\ConfigurableProductGraphQl\Plugin\Product\Configuration\Item;
+
+use Magento\Catalog\Api\Data\ProductInterface;
+use Magento\Catalog\Model\Product\Configuration\Item\ItemInterface;
+use Magento\ConfigurableProduct\Model\Product\Configuration\Item\ItemProductResolver;
+use Magento\ConfigurableProduct\Model\Product\Type\Configurable;
+
+/**
+ * Plugin for item resolver
+ */
+class ItemResolver
+{
+    /**
+     * After plugin for final product
+     *
+     * @param ItemProductResolver $subject
+     * @param $result
+     * @param ItemInterface $item
+     * @return ProductInterface
+     */
+    public function afterGetFinalProduct(ItemProductResolver $subject, $result, ItemInterface $item): ProductInterface
+    {
+        if ($result->getTypeId() === Configurable::TYPE_CODE) {
+            $option = $item->getOptionByCode('simple_product');
+            $result = $option ? $option->getProduct() : $item->getProduct();
+        }
+
+        return $result;
+    }
+}

app/code/Magento/ConfigurableProductGraphQl/etc/graphql/di.xml

@@ -59,4 +59,8 @@
             </argument>
         </arguments>
     </type>
+
+    <type name="Magento\ConfigurableProduct\Model\Product\Configuration\Item\ItemProductResolver">
+        <plugin name="configured_variant" type="Magento\ConfigurableProductGraphQl\Plugin\Product\Configuration\Item\ItemResolver"/>
+    </type>
 </config>

dev/tests/api-functional/testsuite/Magento/GraphQl/ConfigurableProduct/AddConfigurableProductToCartTest.php

@@ -466,6 +466,7 @@ public function testAddConfigurableProductWithImageToCartParentImage(): void
 
         $quantity = 1;
         $parentSku = $product['sku'];
+        $sku = 'simple_20';
 
         $query = $this->graphQlQueryForVariant(
             $this->getMaskedQuoteIdByReservedOrderId->execute('test_order_1'),
@@ -482,13 +483,13 @@ public function testAddConfigurableProductWithImageToCartParentImage(): void
         self::assertArrayHasKey('configured_variant', $cartItem);
 
         $variant = $cartItem['configured_variant'];
-        $expectedThumbnailUrl = 'thumbnail.jpg';
-        $expectedThumbnailLabel = 'Configurable Product';
+        $expectedThumbnailUrl = 'magento_thumbnail.jpg';
+        $expectedThumbnailLabel = 'Thumbnail Image';
         $variantImage = basename($variant['thumbnail']['url']);
 
         self::assertEquals($expectedThumbnailUrl, $variantImage);
         self::assertEquals($expectedThumbnailLabel, $variant['thumbnail']['label']);
-        self::assertEquals($parentSku, $variant['sku']);
+        self::assertEquals($sku, $variant['sku']);
     }
 
     /**