LYNX-149: Cache identity for attributesMetadata query (#114)

* LYNX-149: Cache identity for attributesMetadata query

Author: eliseacornejo

app/code/Magento/EavGraphQl/Model/Output/GetAttributeData.php

@@ -63,6 +63,7 @@ public function execute(
         int $storeId
     ): array {
         return [
+            'id' => $attribute->getAttributeId(),
             'uid' => $this->attributeUid->encode($entityType, $attribute->getAttributeCode()),
             'code' => $attribute->getAttributeCode(),
             'label' => $attribute->getStoreLabel($storeId),

app/code/Magento/EavGraphQl/Model/Resolver/Cache/CustomAttributeMetadataV2Identity.php

@@ -0,0 +1,39 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\EavGraphQl\Model\Resolver\Cache;
+
+use Magento\Eav\Model\Entity\Attribute as EavAttribute;
+use Magento\Framework\GraphQl\Query\Resolver\IdentityInterface;
+
+/**
+ * Cache identity provider for custom attribute metadata query results.
+ */
+class CustomAttributeMetadataV2Identity implements IdentityInterface
+{
+    /**
+     * @inheritDoc
+     */
+    public function getIdentities(array $resolvedData): array
+    {
+        $identities = [];
+        if (isset($resolvedData['items']) && !empty($resolvedData['items'])) {
+            foreach ($resolvedData['items'] as $item) {
+                if (is_array($item)) {
+                    $identities[] = sprintf(
+                        "%s_%s",
+                        EavAttribute::CACHE_TAG,
+                        $item['id']
+                    );
+                }
+            }
+        } else {
+            return [];
+        }
+        return $identities;
+    }
+}

app/code/Magento/EavGraphQl/etc/schema.graphqls

@@ -8,7 +8,7 @@ type Query {
     @doc(description: "Return the attribute type, given an attribute code and entity type.")
     @cache(cacheIdentity: "Magento\\EavGraphQl\\Model\\Resolver\\Cache\\CustomAttributeMetadataIdentity")
     @deprecated(reason: "Use `customAttributeMetadataV2` query instead.")
-    customAttributeMetadataV2(attributes: [AttributeInput!]): AttributesMetadataOutput! @resolver(class: "Magento\\EavGraphQl\\Model\\Resolver\\AttributesMetadata") @doc(description: "Retrieve EAV attributes metadata.")
+    customAttributeMetadataV2(attributes: [AttributeInput!]): AttributesMetadataOutput! @resolver(class: "Magento\\EavGraphQl\\Model\\Resolver\\AttributesMetadata") @doc(description: "Retrieve EAV attributes metadata.") @cache(cacheIdentity: "Magento\\EavGraphQl\\Model\\Resolver\\Cache\\CustomAttributeMetadataV2Identity")
     attributesForm(formCode: String! @doc(description: "Form code.")): AttributesFormOutput! @resolver(class: "Magento\\EavGraphQl\\Model\\Resolver\\AttributesForm") @doc(description: "Retrieve EAV attributes associated to a frontend form.")
     attributesList(entityType: AttributeEntityTypeEnum! @doc(description: "Entity type.")): AttributesMetadataOutput @resolver(class: "Magento\\EavGraphQl\\Model\\Resolver\\AttributesList") @doc(description: "Returns a list of attributes metadata for a given entity type.") @cache(cacheable: false)
 }