getting instance ElementMetadataKeyValuePairType instead creating new. (#927)

Author: vmalyk

src/GraphQL/DataObjectType/MultihrefMetadataType.php

@@ -59,14 +59,15 @@ public function build(&$config)
     {
         $fieldDefinition = $this->fieldDefinition;
         $class = $this->class;
+        $metadataKeyValuePairType = ElementMetadataKeyValuePairType::getInstance();
         $resolver = new MultihrefMetadata($fieldDefinition, $class, $this->getGraphQlService()->getObjectFieldHelper());
         $fields = ['element' =>
                        [
                            'type' => new HrefType($this->getGraphQlService(), $this->fieldDefinition, $this->class),
                            'resolve' => [$resolver, 'resolveElement'],
                        ],
                    'metadata' => [
-                       'type' => Type::listOf(new ElementMetadataKeyValuePairType()),
+                       'type' => Type::listOf($metadataKeyValuePairType),
                        'resolve' => [$resolver, 'resolveMetadata'],
                    ]];
 

src/GraphQL/DataObjectType/ObjectMetadataType.php

@@ -67,7 +67,7 @@ public function build(&$config)
 
         $className = $fieldDefinition->getAllowedClassId();
         $elementTypeDefinition = ClassTypeDefinitions::get($className);
-
+        $metadataKeyValuePairType = ElementMetadataKeyValuePairType::getInstance();
         $resolver = new ObjectMetadata($fieldDefinition, $class, $fieldHelper);
 
         $fields = ['element' =>
@@ -76,7 +76,7 @@ public function build(&$config)
                 'resolve' => [$resolver, 'resolveElement'],
             ],
             'metadata' => [
-                'type' => Type::listOf(new ElementMetadataKeyValuePairType()),
+                'type' => Type::listOf($metadataKeyValuePairType),
                 'resolve' => [$resolver, 'resolveMetadata'],
 
             ]];