Serialization of Languages config fixed.

src/Squidex.Domain.Apps.Core.Model/Apps/LanguagesConfig.cs

@@ -13,6 +13,8 @@ using System.Collections.Immutable;
 using System.Linq;
 using Squidex.Infrastructure;
 
+#pragma warning disable IDE0016 // Use 'throw' expression
+
 namespace Squidex.Domain.Apps.Core.Apps
 {
     public sealed class LanguagesConfig : IFieldPartitioning
@@ -102,7 +104,7 @@ namespace Squidex.Domain.Apps.Core.Apps
             var newMaster =
                 state.Master.Language != language ?
                 state.Master :
-                null;
+                state.Languages.Values.FirstOrDefault();
 
             state = new State(newLanguages, newMaster);
         }
@@ -161,11 +163,6 @@ namespace Squidex.Domain.Apps.Core.Apps
                     throw new InvalidOperationException("Config has no master language.");
                 }
 
-                if (master.IsOptional)
-                {
-                    throw new InvalidOperationException("Config has an optional master language.");
-                }
-
                 this.Master = master;
             }
         }

src/Squidex.Domain.Apps.Read.MongoDb/Apps/MongoAppEntity.cs

@@ -40,17 +40,17 @@ namespace Squidex.Domain.Apps.Read.MongoDb.Apps
         [BsonRequired]
         [BsonElement]
         [BsonJson]
-        public AppClients Clients { get; set; } = new AppClients();
+        public AppClients Clients { get; set; }
 
         [BsonRequired]
         [BsonElement]
         [BsonJson]
-        public AppContributors Contributors { get; set; } = new AppContributors();
+        public AppContributors Contributors { get; set; }
 
         [BsonRequired]
         [BsonElement]
         [BsonJson]
-        public LanguagesConfig LanguagesConfig { get; } = LanguagesConfig.Build(Language.EN);
+        public LanguagesConfig LanguagesConfig { get; set; }
 
         public PartitionResolver PartitionResolver
         {

src/Squidex.Domain.Apps.Read.MongoDb/Apps/MongoAppRepository_EventHandling.cs

@@ -9,10 +9,12 @@
 using System;
 using System.Linq;
 using System.Threading.Tasks;
+using Squidex.Domain.Apps.Core.Apps;
 using Squidex.Domain.Apps.Events;
 using Squidex.Domain.Apps.Events.Apps;
 using Squidex.Domain.Apps.Events.Apps.Utils;
 using Squidex.Domain.Apps.Read.MongoDb.Utils;
+using Squidex.Infrastructure;
 using Squidex.Infrastructure.CQRS.Events;
 using Squidex.Infrastructure.Dispatching;
 using Squidex.Infrastructure.Reflection;
@@ -41,6 +43,11 @@ namespace Squidex.Domain.Apps.Read.MongoDb.Apps
             return Collection.CreateAsync(@event, headers, a =>
             {
                 SimpleMapper.Map(@event, a);
+
+                a.Clients = new AppClients();
+                a.Contributors = new AppContributors();
+
+                a.LanguagesConfig = LanguagesConfig.Build(Language.EN);
             });
         }
 

src/Squidex/app/features/settings/pages/clients/clients-page.component.ts

@@ -113,9 +113,9 @@ export class ClientsPageComponent extends AppComponentBase implements OnInit {
                 .switchMap(app => this.appClientsService.postClient(app, requestDto, this.appClients.version))
                 .subscribe(dto => {
                     this.updateClients(this.appClients.addClient(dto.payload, dto.version));
+                    this.resetClientForm();
                 }, error => {
                     this.notifyError(error);
-                }, () => {
                     this.resetClientForm();
                 });
         }

tests/Squidex.Domain.Apps.Core.Tests/Model/Apps/LanguagesConfigTests.cs

@@ -204,14 +204,6 @@ namespace Squidex.Domain.Apps.Core.Model.Apps
             Assert.Throws<InvalidOperationException>(() => config.Set(new LanguageConfig(Language.DE, false, Language.EN)));
         }
 
-        [Fact]
-        public void Should_throw_exception_if_language_to_make_optional_is_master_language()
-        {
-            var config = LanguagesConfig.Build(Language.DE);
-
-            Assert.Throws<InvalidOperationException>(() => config.Set(new LanguageConfig(Language.DE, true)));
-        }
-
         [Fact]
         public void Should_provide_enumerators()
         {