Added file

src/Squidex.Domain.Apps.Entities/Contents/GraphQL/Types/Utils/GuidGraphType2.cs

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+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using System;
+using GraphQL.Language.AST;
+using GraphQL.Types;
+
+namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types.Utils
+{
+    public sealed class GuidGraphType2 : ScalarGraphType
+    {
+        public GuidGraphType2()
+        {
+            Name = "Guid";
+
+            Description = "The `Guid` scalar type global unique identifier";
+        }
+
+        public override object Serialize(object value)
+        {
+            return ParseValue(value)?.ToString();
+        }
+
+        public override object ParseValue(object value)
+        {
+            if (value is Guid guid)
+            {
+                return guid;
+            }
+
+            var inputValue = value?.ToString().Trim('"');
+
+            if (Guid.TryParse(inputValue, out guid))
+            {
+                return guid;
+            }
+
+            return null;
+        }
+
+        public override object ParseLiteral(IValue value)
+        {
+            if (value is StringValue stringValue)
+            {
+                return ParseValue(stringValue.Value);
+            }
+
+            return null;
+        }
+    }
+}