MAGETWO-64282: Out of stock associated products to configurable are not full page cache cleaned #8009

- Clear cache for parent product when simple product becomes out of stock.

Author: AlexeyManenok

app/code/Magento/CatalogInventory/Model/Indexer/Stock/CacheCleaner.php

@@ -10,8 +10,10 @@
 
 use Magento\CatalogInventory\Api\StockConfigurationInterface;
 use Magento\Framework\App\ResourceConnection;
+use Magento\Framework\App\ObjectManager;
 use Magento\Framework\DB\Adapter\AdapterInterface;
 use Magento\Framework\Event\ManagerInterface;
+use Magento\Framework\EntityManager\MetadataPool;
 use Magento\Framework\Indexer\CacheContext;
 use Magento\CatalogInventory\Model\Stock;
 use Magento\Catalog\Model\Product;
@@ -46,22 +48,30 @@ class CacheCleaner
      */
     private $connection;
 
+    /**
+     * @var MetadataPool
+     */
+    private $metadataPool;
+
     /**
      * @param ResourceConnection $resource
      * @param StockConfigurationInterface $stockConfiguration
      * @param CacheContext $cacheContext
      * @param ManagerInterface $eventManager
+     * @param MetadataPool|null $metadataPool
      */
     public function __construct(
         ResourceConnection $resource,
         StockConfigurationInterface $stockConfiguration,
         CacheContext $cacheContext,
-        ManagerInterface $eventManager
+        ManagerInterface $eventManager,
+        MetadataPool $metadataPool = null
     ) {
         $this->resource = $resource;
         $this->stockConfiguration = $stockConfiguration;
         $this->cacheContext = $cacheContext;
         $this->eventManager = $eventManager;
+        $this->metadataPool = $metadataPool ?: ObjectManager::getInstance()->get(MetadataPool::class);
     }
 
     /**
@@ -76,7 +86,7 @@ public function clean(array $productIds, callable $reindex)
         $productStatusesAfter = $this->getProductStockStatuses($productIds);
         $productIds = $this->getProductIdsForCacheClean($productStatusesBefore, $productStatusesAfter);
         if ($productIds) {
-            $this->cacheContext->registerEntities(Product::CACHE_TAG, $productIds);
+            $this->cacheContext->registerEntities(Product::CACHE_TAG, array_unique($productIds));
             $this->eventManager->dispatch('clean_cache_by_tags', ['object' => $this->cacheContext]);
         }
     }
@@ -87,11 +97,24 @@ public function clean(array $productIds, callable $reindex)
      */
     private function getProductStockStatuses(array $productIds)
     {
+        $linkField = $this->metadataPool->getMetadata(\Magento\Catalog\Api\Data\ProductInterface::class)
+            ->getLinkField();
         $select = $this->getConnection()->select()
             ->from(
-                $this->resource->getTableName('cataloginventory_stock_status'),
+                ['css' => $this->resource->getTableName('cataloginventory_stock_status')],
                 ['product_id', 'stock_status', 'qty']
-            )->where('product_id IN (?)', $productIds)
+            )
+            ->joinLeft(
+                ['cpr' => $this->resource->getTableName('catalog_product_relation')],
+                'css.product_id = cpr.child_id',
+                []
+            )
+            ->joinLeft(
+                ['cpe' => $this->resource->getTableName('catalog_product_entity')],
+                'cpr.parent_id = cpe.' . $linkField,
+                ['parent_id' => 'cpe.entity_id']
+            )
+            ->where('product_id IN (?)', $productIds)
             ->where('stock_id = ?', Stock::DEFAULT_STOCK_ID)
             ->where('website_id = ?', $this->stockConfiguration->getDefaultScopeId());
 
@@ -125,6 +148,9 @@ private function getProductIdsForCacheClean(array $productStatusesBefore, array
             if ($statusBefore['stock_status'] !== $statusAfter['stock_status']
                 || ($stockThresholdQty && $statusAfter['qty'] <= $stockThresholdQty)) {
                 $productIds[] = $productId;
+                if (isset($statusAfter['parent_id'])) {
+                    $productIds[] = $statusAfter['parent_id'];
+                }
             }
         }