Fix error formatting.

backend/src/Squidex.Domain.Apps.Entities/Contents/GraphQL/CachingGraphQLResolver.cs

@@ -55,7 +55,9 @@ public sealed class CachingGraphQLResolver : IConfigureExecution
         options.Schema = await GetSchemaAsync(context.App);
         options.HandleError(serviceProvider);
 
-        return await next(options);
+        var a = await next(options);
+
+        return a;
     }
 
     public async Task<GraphQLSchema> GetSchemaAsync(IAppEntity app)

backend/src/Squidex.Domain.Apps.Entities/Contents/GraphQL/Types/ErrorProvider.cs

@@ -0,0 +1,35 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using GraphQL;
+using GraphQL.Execution;
+using Squidex.Infrastructure;
+using Squidex.Infrastructure.Validation;
+
+namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types;
+
+public sealed class ErrorProvider : ErrorInfoProvider
+{
+    public override ErrorInfo GetInfo(ExecutionError executionError)
+    {
+        var actual = base.GetInfo(executionError);
+
+        if (executionError.InnerException is ValidationException or DomainException)
+        {
+            if (!string.IsNullOrWhiteSpace(actual.Message))
+            {
+                actual.Message = $"{actual.Message} - {executionError.InnerException.Message}";
+            }
+            else
+            {
+                actual.Message = executionError.InnerException.Message;
+            }
+        }
+
+        return actual;
+    }
+}

backend/src/Squidex.Domain.Apps.Entities/Contents/GraphQL/Types/ErrorVisitor.cs

@@ -33,11 +33,6 @@ internal static class ErrorVisitor
                 log.LogError(context.OriginalException, "Failed to resolve execute query.");
             }
 
-            if (context.OriginalException is ValidationException or DomainException)
-            {
-                context.Exception = new ExecutionError(context.OriginalException.Message);
-            }
-
             return Task.CompletedTask;
         };
     }

backend/src/Squidex/Config/Web/WebServices.cs

@@ -7,6 +7,7 @@
 
 using GraphQL;
 using GraphQL.DI;
+using GraphQL.Execution;
 using GraphQL.Server.Transports.AspNetCore;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.Infrastructure;
@@ -17,6 +18,7 @@ using Squidex.Config.Domain;
 using Squidex.Domain.Apps.Core.Contents;
 using Squidex.Domain.Apps.Entities;
 using Squidex.Domain.Apps.Entities.Contents.GraphQL;
+using Squidex.Domain.Apps.Entities.Contents.GraphQL.Types;
 using Squidex.Infrastructure.Caching;
 using Squidex.Infrastructure.Json.Objects;
 using Squidex.Pipeline.Plugins;
@@ -107,6 +109,7 @@ public static class WebServices
         services.AddGraphQL(builder =>
         {
             builder.UseApolloTracing();
+            builder.AddErrorInfoProvider<ErrorProvider>();
             builder.AddSchema<DummySchema>();
             builder.AddSystemTextJson();
             builder.AddDataLoader();