B2B-2255: "Currency" GraphQl query has no cache identity

Author: joanhe

app/code/Magento/DirectoryGraphQl/Model/Cache/Tag/Strategy/Currency.php

@@ -7,13 +7,15 @@
 
 namespace Magento\DirectoryGraphQl\Plugin;
 
+use Magento\DirectoryGraphQl\Model\Resolver\Currency\Identity;
+use Magento\Framework\DataObject\IdentityInterface;
 use Magento\Framework\Event\ManagerInterface;
 use Magento\Directory\Model\Currency as CurrencyModel;
 
 /**
  * Currency plugin
  */
-class Currency
+class Currency implements IdentityInterface
 {
     /**
      * Application Event Dispatcher
@@ -40,7 +42,15 @@ public function __construct(ManagerInterface $eventManager)
      */
     public function afterSaveRates(CurrencyModel $subject, CurrencyModel $result): CurrencyModel
     {
-        $this->eventManager->dispatch('clean_cache_by_tags', ['object' => $result]);
+        $this->eventManager->dispatch('clean_cache_by_tags', ['object' => $this]);
         return $result;
     }
+
+    /**
+     * @inheritdoc
+     */
+    public function getIdentities()
+    {
+        return [Identity::CACHE_TAG];
+    }
 }

app/code/Magento/DirectoryGraphQl/Plugin/Currency.php

@@ -10,7 +10,6 @@
         <arguments>
             <argument name="customStrategies" xsi:type="array">
                 <item name="Magento\Framework\App\Config\ValueInterface" xsi:type="object">\Magento\DirectoryGraphQl\Model\Cache\Tag\Strategy\CurrencyConfig</item>
-                <item name="Magento\Directory\Model\Currency" xsi:type="object">\Magento\DirectoryGraphQl\Model\Cache\Tag\Strategy\Currency</item>
             </argument>
         </arguments>
     </type>