Merge remote-tracking branch 'origin/MAGETWO-37730' into develop

Author: Leonid Poluyanov

app/code/Magento/CatalogInventory/Model/Adminhtml/Stock/Item.php

@@ -11,13 +11,15 @@
 use Magento\Customer\Api\GroupManagementInterface;
 use Magento\Framework\Api\AttributeValueFactory;
 use Magento\Framework\Api\ExtensionAttributesFactory;
+use Magento\Framework\Object\IdentityInterface;
+use Magento\Catalog\Model\Product;
 
 /**
  * Catalog Inventory Stock Model for adminhtml area
  * @method \Magento\CatalogInventory\Api\Data\StockItemExtensionInterface getExtensionAttributes()
  * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
  */
-class Item extends \Magento\CatalogInventory\Model\Stock\Item
+class Item extends \Magento\CatalogInventory\Model\Stock\Item implements IdentityInterface
 {
     /**
      * @var GroupManagementInterface
@@ -122,4 +124,17 @@ public function getShowDefaultNotificationMessage()
     {
         return true;
     }
+
+    /**
+     * @inheritdoc
+     */
+    public function getIdentities()
+    {
+        $tags = [];
+        if ($this->getProductId()) {
+            $tags[] = Product::CACHE_TAG . '_' . $this->getProductId();
+        }
+
+        return $tags;
+    }
 }

app/code/Magento/CatalogInventory/Test/Unit/Model/Adminhtml/Stock/ItemTest.php

@@ -58,4 +58,10 @@ public function testGetCustomerGroupId()
         $this->_model->setCustomerGroupId(2);
         $this->assertEquals(2, $this->_model->getCustomerGroupId());
     }
+
+    public function testGetIdentities()
+    {
+        $this->_model->setProductId(1);
+        $this->assertEquals(['catalog_product_1'], $this->_model->getIdentities());
+    }
 }