magento/graphql-ce#741: Add extension point to set custom parameters to Query Context object

Author: naydav

app/code/Magento/CustomerGraphQl/Model/Resolver/IsSubscribed.php

@@ -8,6 +8,7 @@
 namespace Magento\CustomerGraphQl\Model\Resolver;
 
 use Magento\CustomerGraphQl\Model\Customer\GetCustomer;
+use Magento\Framework\Exception\LocalizedException;
 use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
 use Magento\Framework\GraphQl\Config\Element\Field;
 use Magento\Framework\GraphQl\Query\ResolverInterface;
@@ -50,7 +51,11 @@ public function resolve(
         array $value = null,
         array $args = null
     ) {
-        $customer = $this->getCustomer->execute($context);
+        if (!isset($value['model'])) {
+            throw new LocalizedException(__('"model" value should be specified'));
+        }
+        /** @var Customer $customer */
+        $customer = $value['model'];
 
         $status = $this->subscriberFactory->create()->loadByCustomerId((int)$customer->getId())->isSubscribed();
         return (bool)$status;