[Improvement] Added system field "key" as optional argument for data object mutation (#987)

* Added system field "key" as optional argument for data object mutation

* Updated Upgrade Notes

Author: SimonCremer

doc/01_Installation_and_Upgrade/01_Upgrade_Notes.md

@@ -1,5 +1,8 @@
 # Upgrade Notes
 
+## 2.2.0
+- [MutationType] Added system field `key` as an optional argument for data object mutation
+
 ## 2.0.0
 
 - [General] Marked several classes as internal and/or final.

src/GraphQL/Mutation/MutationType.php

@@ -726,6 +726,7 @@ public function buildDataObjectMutations(&$config = [], $context = [])
                     'type' => $updateResultType,
                     'args' => [
                         'id' => ['type' => Type::int()],
+                        'key' => ['type' => Type::string()],
                         'fullpath' => ['type' => Type::string()],
                         'parentId' => ['type' => Type::int()],
                         'defaultLanguage' => ['type' => Type::string()],
@@ -882,6 +883,16 @@ public function getUpdateObjectResolver($processors, $localeService, $object = n
                     $object->setOmitMandatoryCheck($args['omitMandatoryCheck']);
                 }
 
+                if (isset($args['key'])) {
+                    if (!DataObject\Service::isValidKey($args['key'], AbstractObject::OBJECT_TYPE_OBJECT)) {
+                        return [
+                            'success' => false,
+                            'message' => '"key" is not valid',
+                        ];
+                    }
+                    $object->setKey($args['key']);
+                }
+
                 $tags = [];
                 if (isset($args['input'])) {
                     $dataIn = $args['input'];