Fix FieldtypePage bug when FieldtypePage:derefAsPageOrNullPage option is enabled.

Author: dadish

src/Type/Inputfield/InputfieldPage.php

@@ -3,6 +3,7 @@
 use GraphQL\Type\Definition\InputObjectType;
 use GraphQL\Type\Definition\Type;
 use ProcessWire\Page;
+use ProcessWire\FieldtypePage;
 use ProcessWire\GraphQL\Cache;
 use ProcessWire\GraphQL\Utils;
 
@@ -52,6 +53,7 @@ public static function inputField($field)
 
   public static function setValue(Page $page, $field, $value)
   {
+    $field->derefAsPage = FieldtypePage::derefAsPageArray;
     $fieldName = $field->name;
     $fieldValue = $page->$fieldName;
     if (isset($value['add'])) {

test/Field/Page/Fieldtype/FieldtypePage/FieldtypePageCaseFiveTest.php

@@ -0,0 +1,60 @@
+<?php
+
+namespace ProcessWire\GraphQL\Test\Field\Page\Fieldtype;
+
+/**
+ * Should properly handle FieldtypePage::derefAsPageArray option.
+ */
+use \ProcessWire\GraphQL\Test\GraphQLTestCase;
+use ProcessWire\FieldtypePage;
+use ProcessWire\GraphQL\Utils;
+
+class FieldtypePageCaseFiveTest extends GraphQLTestCase {
+
+  const settings = [
+    'login' => 'admin',
+    'legalTemplates' => ['skyscraper', 'architect', 'city'],
+		'legalFields' => ['architects', 'title'],
+		'access' => [
+			'fields' => [
+				[
+					'name' => 'architects',
+					'derefAsPage' => FieldtypePage::derefAsPageOrNullPage,
+				]
+			]
+		]
+  ];
+
+  public function testValue()
+  {
+		$architect = Utils::pages()->get(4476);
+  	$query = 'mutation createSkyscraper($page: SkyscraperCreateInput!){
+  		createSkyscraper (page: $page) {
+				title,
+				name,
+				architects {
+					list {
+						id,
+					}
+				}
+  		}
+		}';
+		$name = 'new-sky-test-158';
+		$title = 'New Sky Test 158';
+    $variables = [
+      'page' => [
+				'name' => $name,
+				'title' => $title,
+				'parent' => "4114",
+				'architects' => [
+					'add' => [$architect->id]
+				]
+			]
+    ];
+		$res = self::execute($query, $variables);
+		$actual = $res->data->createSkyscraper;
+  	assertEquals($name, $actual->name, 'Sets the correct name.');
+  	assertEquals($title, $actual->title, 'Sets the correct title.');
+  	assertEquals($architect->id, $actual->architects->list[0]->id, 'Sets the correct architect.');
+	}
+}