Event migration.

src/Squidex.Domain.Apps.Core/Schemas/FieldRegistry.cs

@@ -59,10 +59,6 @@ namespace Squidex.Domain.Apps.Core.Schemas
                 (id, name, partitioning, properties) =>
                     new StringField(id, name, partitioning, (StringFieldProperties)properties));
 
-            Add<DateTimeFieldProperties>(
-                (id, name, partitioning, properties) =>
-                    new DateTimeField(id, name, partitioning, (DateTimeFieldProperties)properties));
-
             Add<JsonFieldProperties>(
                 (id, name, partitioning, properties) =>
                     new JsonField(id, name, partitioning, (JsonFieldProperties)properties));
@@ -71,15 +67,20 @@ namespace Squidex.Domain.Apps.Core.Schemas
                 (id, name, partitioning, properties) =>
                     new AssetsField(id, name, partitioning, (AssetsFieldProperties)properties));
 
+            Add<GeolocationFieldProperties>(
+                (id, name, partitioning, properties) =>
+                    new GeolocationField(id, name, partitioning, (GeolocationFieldProperties)properties));
+
             Add<ReferencesFieldProperties>(
                 (id, name, partitioning, properties) =>
                     new ReferencesField(id, name, partitioning, (ReferencesFieldProperties)properties));
 
-            Add<GeolocationFieldProperties>(
+            Add<DateTimeFieldProperties>(
                 (id, name, partitioning, properties) =>
-                    new GeolocationField(id, name, partitioning, (GeolocationFieldProperties)properties));
+                    new DateTimeField(id, name, partitioning, (DateTimeFieldProperties)properties));
 
             typeNameRegistry.MapObsolete(typeof(ReferencesFieldProperties), "DateTime");
+
             typeNameRegistry.MapObsolete(typeof(DateTimeFieldProperties), "References");
         }
 

src/Squidex.Domain.Apps.Events/Contents/Old/ContentArchived.cs

@@ -7,13 +7,19 @@
 // ==========================================================================
 
 using System;
+using Squidex.Domain.Apps.Core.Contents;
 using Squidex.Infrastructure.CQRS.Events;
+using Squidex.Infrastructure.Reflection;
 
-namespace Squidex.Domain.Apps.Events.Contents
+namespace Squidex.Domain.Apps.Events.Contents.Old
 {
     [EventType(nameof(ContentArchived))]
     [Obsolete]
-    public sealed class ContentArchived : ContentEvent
+    public sealed class ContentArchived : ContentEvent, IMigratedEvent
     {
+        public IEvent Migrate()
+        {
+            return SimpleMapper.Map(this, new ContentStatusChanged { Status = Status.Archived });
+        }
     }
 }

src/Squidex.Domain.Apps.Events/Contents/Old/ContentPublished.cs

@@ -7,13 +7,19 @@
 // ==========================================================================
 
 using System;
+using Squidex.Domain.Apps.Core.Contents;
 using Squidex.Infrastructure.CQRS.Events;
+using Squidex.Infrastructure.Reflection;
 
-namespace Squidex.Domain.Apps.Events.Contents
+namespace Squidex.Domain.Apps.Events.Contents.Old
 {
     [EventType(nameof(ContentPublished))]
     [Obsolete]
-    public sealed class ContentPublished : ContentEvent
+    public sealed class ContentPublished : ContentEvent, IMigratedEvent
     {
+        public IEvent Migrate()
+        {
+            return SimpleMapper.Map(this, new ContentStatusChanged { Status = Status.Published });
+        }
     }
 }

src/Squidex.Domain.Apps.Events/Contents/Old/ContentRestored.cs

@@ -7,13 +7,19 @@
 // ==========================================================================
 
 using System;
+using Squidex.Domain.Apps.Core.Contents;
 using Squidex.Infrastructure.CQRS.Events;
+using Squidex.Infrastructure.Reflection;
 
-namespace Squidex.Domain.Apps.Events.Contents
+namespace Squidex.Domain.Apps.Events.Contents.Old
 {
     [EventType(nameof(ContentRestored))]
     [Obsolete]
-    public sealed class ContentRestored : ContentEvent
+    public sealed class ContentRestored : ContentEvent, IMigratedEvent
     {
+        public IEvent Migrate()
+        {
+            return SimpleMapper.Map(this, new ContentStatusChanged { Status = Status.Draft });
+        }
     }
 }

src/Squidex.Domain.Apps.Events/Contents/Old/ContentUnpublished.cs

@@ -7,13 +7,19 @@
 // ==========================================================================
 
 using System;
+using Squidex.Domain.Apps.Core.Contents;
 using Squidex.Infrastructure.CQRS.Events;
+using Squidex.Infrastructure.Reflection;
 
-namespace Squidex.Domain.Apps.Events.Contents
+namespace Squidex.Domain.Apps.Events.Contents.Old
 {
     [EventType(nameof(ContentUnpublished))]
     [Obsolete]
-    public sealed class ContentUnpublished : ContentEvent
+    public sealed class ContentUnpublished : ContentEvent, IMigratedEvent
     {
+        public IEvent Migrate()
+        {
+            return SimpleMapper.Map(this, new ContentStatusChanged { Status = Status.Draft });
+        }
     }
 }

src/Squidex.Domain.Apps.Events/Schemas/Old/WebhookAdded.cs

@@ -13,12 +13,17 @@ namespace Squidex.Domain.Apps.Events.Schemas.Old
 {
     [EventType(nameof(WebhookAdded))]
     [Obsolete]
-    public sealed class WebhookAdded : SchemaEvent
+    public sealed class WebhookAdded : SchemaEvent, IMigratedEvent
     {
         public Guid Id { get; set; }
 
         public Uri Url { get; set; }
 
         public string SharedSecret { get; set; }
+
+        public IEvent Migrate()
+        {
+            return new NoopEvent();
+        }
     }
 }

src/Squidex.Domain.Apps.Events/Schemas/Old/WebhookDeleted.cs

@@ -13,8 +13,13 @@ namespace Squidex.Domain.Apps.Events.Schemas.Old
 {
     [EventType(nameof(WebhookDeleted))]
     [Obsolete]
-    public sealed class WebhookDeleted : SchemaEvent
+    public sealed class WebhookDeleted : SchemaEvent, IMigratedEvent
     {
         public Guid Id { get; set; }
+
+        public IEvent Migrate()
+        {
+            return new NoopEvent();
+        }
     }
 }

src/Squidex.Domain.Apps.Read.MongoDb/Contents/MongoContentRepository_EventHandling.cs

@@ -9,7 +9,6 @@
 using System;
 using System.Threading.Tasks;
 using MongoDB.Driver;
-using Squidex.Domain.Apps.Core.Contents;
 using Squidex.Domain.Apps.Events.Apps;
 using Squidex.Domain.Apps.Events.Assets;
 using Squidex.Domain.Apps.Events.Contents;
@@ -18,8 +17,6 @@ using Squidex.Infrastructure.CQRS.Events;
 using Squidex.Infrastructure.Dispatching;
 using Squidex.Infrastructure.Reflection;
 
-#pragma warning disable CS0612 // Type or member is obsolete
-
 namespace Squidex.Domain.Apps.Read.MongoDb.Contents
 {
     public partial class MongoContentRepository
@@ -95,39 +92,6 @@ namespace Squidex.Domain.Apps.Read.MongoDb.Contents
             });
         }
 
-        protected Task On(ContentPublished @event, EnvelopeHeaders headers)
-        {
-            return ForAppIdAsync(@event.AppId.Id, collection =>
-            {
-                return collection.UpdateAsync(@event, headers, x =>
-                {
-                    x.Status = Status.Published;
-                });
-            });
-        }
-
-        protected Task On(ContentUnpublished @event, EnvelopeHeaders headers)
-        {
-            return ForAppIdAsync(@event.AppId.Id, collection =>
-            {
-                return collection.UpdateAsync(@event, headers, x =>
-                {
-                    x.Status = Status.Draft;
-                });
-            });
-        }
-
-        protected Task On(ContentArchived @event, EnvelopeHeaders headers)
-        {
-            return ForAppIdAsync(@event.AppId.Id, collection =>
-            {
-                return collection.UpdateAsync(@event, headers, x =>
-                {
-                    x.Status = Status.Archived;
-                });
-            });
-        }
-
         protected Task On(ContentStatusChanged @event, EnvelopeHeaders headers)
         {
             return ForAppIdAsync(@event.AppId.Id, collection =>
@@ -139,17 +103,6 @@ namespace Squidex.Domain.Apps.Read.MongoDb.Contents
             });
         }
 
-        protected Task On(ContentRestored @event, EnvelopeHeaders headers)
-        {
-            return ForAppIdAsync(@event.AppId.Id, collection =>
-            {
-                return collection.UpdateAsync(@event, headers, x =>
-                {
-                    x.Status = Status.Draft;
-                });
-            });
-        }
-
         protected Task On(AssetDeleted @event, EnvelopeHeaders headers)
         {
             return ForAppIdAsync(@event.AppId.Id, collection =>

src/Squidex.Domain.Apps.Read/Contents/ContentHistoryEventsCreator.cs

@@ -12,8 +12,6 @@ using Squidex.Domain.Apps.Read.History;
 using Squidex.Infrastructure;
 using Squidex.Infrastructure.CQRS.Events;
 
-#pragma warning disable CS0612 // Type or member is obsolete
-
 namespace Squidex.Domain.Apps.Read.Contents
 {
     public sealed class ContentHistoryEventsCreator : HistoryEventsCreatorBase
@@ -30,15 +28,6 @@ namespace Squidex.Domain.Apps.Read.Contents
             AddEventMessage<ContentDeleted>(
                 "deleted content item.");
 
-            AddEventMessage<ContentRestored>(
-                "restored content item.");
-
-            AddEventMessage<ContentPublished>(
-                "published content item.");
-
-            AddEventMessage<ContentUnpublished>(
-                "unpublished content item.");
-
             AddEventMessage<ContentStatusChanged>(
                 "change status of content item to {[Status]}.");
         }

src/Squidex.Domain.Apps.Write/Schemas/SchemaEvents.cs

@@ -0,0 +1,10 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Squidex.Domain.Apps.Write.Schemas
+{
+    public class SchemaEvents
+    {
+    }
+}

src/Squidex.Infrastructure/CQRS/Events/EventDataFormatter.cs

@@ -25,21 +25,33 @@ namespace Squidex.Infrastructure.CQRS.Events
             this.serializerSettings = serializerSettings ?? new JsonSerializerSettings();
         }
 
-        public virtual Envelope<IEvent> Parse(EventData eventData)
+        public virtual Envelope<IEvent> Parse(EventData eventData, bool migrate = true)
         {
             var headers = ReadJson<PropertiesBag>(eventData.Metadata);
 
             var eventType = typeNameRegistry.GetType(eventData.Type);
-            var eventContent = ReadJson<IEvent>(eventData.Payload, eventType);
+            var eventPayload = ReadJson<IEvent>(eventData.Payload, eventType);
 
-            var envelope = new Envelope<IEvent>(eventContent, headers);
+            if (migrate && eventPayload is IMigratedEvent migratedEvent)
+            {
+                eventPayload = migratedEvent.Migrate();
+            }
+
+            var envelope = new Envelope<IEvent>(eventPayload, headers);
 
             return envelope;
         }
 
-        public virtual EventData ToEventData(Envelope<IEvent> envelope, Guid commitId)
+        public virtual EventData ToEventData(Envelope<IEvent> envelope, Guid commitId, bool migrate = true)
         {
-            var eventType = typeNameRegistry.GetName(envelope.Payload.GetType());
+            var eventPayload = envelope.Payload;
+
+            if (migrate && eventPayload is IMigratedEvent migratedEvent)
+            {
+                eventPayload = migratedEvent.Migrate();
+            }
+
+            var eventType = typeNameRegistry.GetName(eventPayload.GetType());
 
             envelope.SetCommitId(commitId);
 

src/Squidex.Infrastructure/CQRS/Events/IMigratedEvent.cs

@@ -0,0 +1,15 @@
+// ==========================================================================
+//  IMigratedEvent.cs
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex Group
+//  All rights reserved.
+// ==========================================================================
+
+namespace Squidex.Infrastructure.CQRS.Events
+{
+    public interface IMigratedEvent
+    {
+        IEvent Migrate();
+    }
+}

src/Squidex.Infrastructure/CQRS/Events/NoopEvent.cs

@@ -0,0 +1,14 @@
+// ==========================================================================
+//  NoopEvent.cs
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex Group
+//  All rights reserved.
+// ==========================================================================
+
+namespace Squidex.Infrastructure.CQRS.Events
+{
+    public sealed class NoopEvent : IEvent
+    {
+    }
+}

tests/Squidex.Domain.Apps.Write.Tests/Contents/ContentEventTests.cs

@@ -0,0 +1,70 @@
+// ==========================================================================
+//  SchemaEventTests.cs
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex Group
+//  All rights reserved.
+// ==========================================================================
+
+using System;
+using Squidex.Domain.Apps.Core.Contents;
+using Squidex.Domain.Apps.Events.Contents;
+using Squidex.Domain.Apps.Events.Contents.Old;
+using Squidex.Domain.Apps.Write.TestHelpers;
+using Squidex.Infrastructure;
+using Xunit;
+
+#pragma warning disable CS0612 // Type or member is obsolete
+
+namespace Squidex.Domain.Apps.Write.Contents
+{
+    public class ContentEventTests
+    {
+        private readonly RefToken actor = new RefToken("User", Guid.NewGuid().ToString());
+        private readonly NamedId<Guid> appId = new NamedId<Guid>(Guid.NewGuid(), "my-app");
+        private readonly NamedId<Guid> schemaId = new NamedId<Guid>(Guid.NewGuid(), "my-schema");
+        private readonly Guid contentId = Guid.NewGuid();
+
+        [Fact]
+        public void Should_migrate_content_published_to_content_status_changed()
+        {
+            var source = CreateEvent(new ContentPublished());
+
+            source.Migrate().ShouldBeSameEvent(CreateEvent(new ContentStatusChanged { Status = Status.Published }));
+        }
+
+        [Fact]
+        public void Should_migrate_content_unpublished_to_content_status_changed()
+        {
+            var source = CreateEvent(new ContentUnpublished());
+
+            source.Migrate().ShouldBeSameEvent(CreateEvent(new ContentStatusChanged { Status = Status.Draft }));
+        }
+
+        [Fact]
+        public void Should_migrate_content_restored_to_content_status_changed()
+        {
+            var source = CreateEvent(new ContentRestored());
+
+            source.Migrate().ShouldBeSameEvent(CreateEvent(new ContentStatusChanged { Status = Status.Draft }));
+        }
+
+        [Fact]
+        public void Should_migrate_content_archived_to_content_status_changed()
+        {
+            var source = CreateEvent(new ContentArchived());
+
+            source.Migrate().ShouldBeSameEvent(CreateEvent(new ContentStatusChanged { Status = Status.Archived }));
+        }
+
+        private T CreateEvent<T>(T contentEvent) where T : ContentEvent
+        {
+            contentEvent.Actor = actor;
+            contentEvent.AppId = appId;
+            contentEvent.SchemaId = schemaId;
+            contentEvent.ContentId = contentId;
+
+            return contentEvent;
+        }
+    }
+}

tests/Squidex.Domain.Apps.Write.Tests/Contents/ContentVersionLoaderTests.cs

@@ -76,7 +76,7 @@ namespace Squidex.Domain.Apps.Write.Contents
             A.CallTo(() => eventStore.GetEventsAsync(streamName))
                 .Returns(events);
 
-            A.CallTo(() => formatter.Parse(eventData1))
+            A.CallTo(() => formatter.Parse(eventData1, true))
                 .Returns(new Envelope<IEvent>(event1));
 
             await Assert.ThrowsAsync<DomainObjectNotFoundException>(() => sut.LoadAsync(appId, id, 0));
@@ -100,9 +100,9 @@ namespace Squidex.Domain.Apps.Write.Contents
             A.CallTo(() => eventStore.GetEventsAsync(streamName))
                 .Returns(events);
 
-            A.CallTo(() => formatter.Parse(eventData1))
+            A.CallTo(() => formatter.Parse(eventData1, true))
                 .Returns(new Envelope<IEvent>(event1));
-            A.CallTo(() => formatter.Parse(eventData2))
+            A.CallTo(() => formatter.Parse(eventData2, true))
                 .Returns(new Envelope<IEvent>(event2));
 
             var data = await sut.LoadAsync(appId, id, 3);
@@ -131,11 +131,11 @@ namespace Squidex.Domain.Apps.Write.Contents
             A.CallTo(() => eventStore.GetEventsAsync(streamName))
                 .Returns(events);
 
-            A.CallTo(() => formatter.Parse(eventData1))
+            A.CallTo(() => formatter.Parse(eventData1, true))
                 .Returns(new Envelope<IEvent>(event1));
-            A.CallTo(() => formatter.Parse(eventData2))
+            A.CallTo(() => formatter.Parse(eventData2, true))
                 .Returns(new Envelope<IEvent>(event2));
-            A.CallTo(() => formatter.Parse(eventData3))
+            A.CallTo(() => formatter.Parse(eventData3, true))
                 .Returns(new Envelope<IEvent>(event3));
 
             var data = await sut.LoadAsync(appId, id, 1);

tests/Squidex.Domain.Apps.Write.Tests/Schemas/SchemaEventTests.cs

@@ -0,0 +1,36 @@
+// ==========================================================================
+//  SchemaEventTests.cs
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex Group
+//  All rights reserved.
+// ==========================================================================
+
+using Squidex.Domain.Apps.Events.Schemas.Old;
+using Squidex.Domain.Apps.Write.TestHelpers;
+using Squidex.Infrastructure.CQRS.Events;
+using Xunit;
+
+#pragma warning disable CS0612 // Type or member is obsolete
+
+namespace Squidex.Domain.Apps.Write.Schemas
+{
+    public class SchemaEventTests
+    {
+        [Fact]
+        public void Should_migrate_webhook_added_event_to_noop()
+        {
+            var source = new WebhookAdded();
+
+            source.Migrate().ShouldBeSameEventType(new NoopEvent());
+        }
+
+        [Fact]
+        public void Should_migrate_webhook_deleted_event_to_noop()
+        {
+            var source = new WebhookDeleted();
+
+            source.Migrate().ShouldBeSameEventType(new NoopEvent());
+        }
+    }
+}

tests/Squidex.Domain.Apps.Write.Tests/TestHelpers/AssertHelper.cs

@@ -23,9 +23,23 @@ namespace Squidex.Domain.Apps.Write.TestHelpers
 
             for (var i = 0; i < source.Length; i++)
             {
-                source[i].Should().BeOfType(others[i].GetType());
+                var lhs = source[i];
-                ((object)source[i]).ShouldBeEquivalentTo(others[i], o => o.IncludingAllDeclaredProperties());
+                var rhs = others[i];
+
+                lhs.ShouldBeSameEvent(rhs);
             }
         }
+
+        public static void ShouldBeSameEvent(this IEvent lhs, IEvent rhs)
+        {
+            lhs.Should().BeOfType(rhs.GetType());
+
+            ((object)lhs).ShouldBeEquivalentTo(rhs, o => o.IncludingAllDeclaredProperties());
+        }
+
+        public static void ShouldBeSameEventType(this IEvent lhs, IEvent rhs)
+        {
+            lhs.Should().BeOfType(rhs.GetType());
+        }
     }
 }

tests/Squidex.Infrastructure.Tests/CQRS/Commands/DefaultDomainObjectRepositoryTests.cs

@@ -96,9 +96,9 @@ namespace Squidex.Infrastructure.CQRS.Commands
             A.CallTo(() => eventStore.GetEventsAsync(streamName))
                 .Returns(events);
 
-            A.CallTo(() => formatter.Parse(eventData1))
+            A.CallTo(() => formatter.Parse(eventData1, true))
                 .Returns(new Envelope<IEvent>(event1));
-            A.CallTo(() => formatter.Parse(eventData2))
+            A.CallTo(() => formatter.Parse(eventData2, true))
                 .Returns(new Envelope<IEvent>(event2));
 
             await sut.LoadAsync(domainObject);
@@ -124,9 +124,9 @@ namespace Squidex.Infrastructure.CQRS.Commands
             A.CallTo(() => eventStore.GetEventsAsync(streamName))
                 .Returns(events);
 
-            A.CallTo(() => formatter.Parse(eventData1))
+            A.CallTo(() => formatter.Parse(eventData1, true))
                 .Returns(new Envelope<IEvent>(event1));
-            A.CallTo(() => formatter.Parse(eventData2))
+            A.CallTo(() => formatter.Parse(eventData2, true))
                 .Returns(new Envelope<IEvent>(event2));
 
             await Assert.ThrowsAsync<DomainObjectVersionException>(() => sut.LoadAsync(domainObject, 200));
@@ -143,9 +143,9 @@ namespace Squidex.Infrastructure.CQRS.Commands
             var eventData1 = new EventData();
             var eventData2 = new EventData();
 
-            A.CallTo(() => formatter.ToEventData(A<Envelope<IEvent>>.That.Matches(e => e.Payload == event1), commitId))
+            A.CallTo(() => formatter.ToEventData(A<Envelope<IEvent>>.That.Matches(e => e.Payload == event1), commitId, true))
                 .Returns(eventData1);
-            A.CallTo(() => formatter.ToEventData(A<Envelope<IEvent>>.That.Matches(e => e.Payload == event2), commitId))
+            A.CallTo(() => formatter.ToEventData(A<Envelope<IEvent>>.That.Matches(e => e.Payload == event2), commitId, true))
                 .Returns(eventData2);
 
             A.CallTo(() => eventStore.AppendEventsAsync(commitId, streamName, 123, A<ICollection<EventData>>.That.Matches(e => e.Count == 2)))
@@ -170,9 +170,9 @@ namespace Squidex.Infrastructure.CQRS.Commands
             var eventData1 = new EventData();
             var eventData2 = new EventData();
 
-            A.CallTo(() => formatter.ToEventData(A<Envelope<IEvent>>.That.Matches(e => e.Payload == event1), commitId))
+            A.CallTo(() => formatter.ToEventData(A<Envelope<IEvent>>.That.Matches(e => e.Payload == event1), commitId, true))
                 .Returns(eventData1);
-            A.CallTo(() => formatter.ToEventData(A<Envelope<IEvent>>.That.Matches(e => e.Payload == event2), commitId))
+            A.CallTo(() => formatter.ToEventData(A<Envelope<IEvent>>.That.Matches(e => e.Payload == event2), commitId, true))
                 .Returns(eventData2);
 
             A.CallTo(() => eventStore.AppendEventsAsync(commitId, streamName, 123, A<ICollection<EventData>>.That.Matches(e => e.Count == 2)))

tests/Squidex.Infrastructure.Tests/CQRS/Events/EventDataFormatterTests.cs

@@ -22,20 +22,35 @@ namespace Squidex.Infrastructure.CQRS.Events
             public string MyProperty { get; set; }
         }
 
+        public sealed class MyOldEvent : IEvent, IMigratedEvent
+        {
+            public string MyProperty { get; set; }
+
+            public IEvent Migrate()
+            {
+                return new MyEvent { MyProperty = MyProperty };
+            }
+        }
+
         private readonly JsonSerializerSettings serializerSettings = new JsonSerializerSettings();
         private readonly TypeNameRegistry typeNameRegistry = new TypeNameRegistry();
+        private readonly EventDataFormatter sut;
 
         public EventDataFormatterTests()
         {
             serializerSettings.Converters.Add(new PropertiesBagConverter());
 
             typeNameRegistry.Map(typeof(MyEvent), "Event");
+            typeNameRegistry.Map(typeof(MyOldEvent), "OldEvent");
+
+            sut = new EventDataFormatter(typeNameRegistry, serializerSettings);
         }
 
         [Fact]
         public void Should_serialize_and_deserialize_envelope()
         {
             var commitId = Guid.NewGuid();
+
             var inputEvent = new Envelope<MyEvent>(new MyEvent { MyProperty = "My-Property" });
 
             inputEvent.SetAggregateId(Guid.NewGuid());
@@ -45,18 +60,44 @@ namespace Squidex.Infrastructure.CQRS.Events
             inputEvent.SetEventStreamNumber(1);
             inputEvent.SetTimestamp(SystemClock.Instance.GetCurrentInstant());
 
-            var sut = new EventDataFormatter(typeNameRegistry, serializerSettings);
-
             var eventData = sut.ToEventData(inputEvent.To<IEvent>(), commitId);
 
             var outputEvent = sut.Parse(eventData).To<MyEvent>();
 
-            CompareHeaders(outputEvent.Headers, inputEvent.Headers);
+            AssertHeaders(inputEvent.Headers, outputEvent.Headers);
+            AssertPayload(inputEvent, outputEvent);
+        }
+
+        [Fact]
+        public void Should_migrate_event_serializing()
+        {
+            var inputEvent = new Envelope<MyOldEvent>(new MyOldEvent { MyProperty = "My-Property" });
+
+            var eventData = sut.ToEventData(inputEvent.To<IEvent>(), Guid.NewGuid());
+
+            var outputEvent = sut.Parse(eventData).To<MyEvent>();
+
+            Assert.Equal(inputEvent.Payload.MyProperty, outputEvent.Payload.MyProperty);
+        }
+
+        [Fact]
+        public void Should_migrate_event_deserializing()
+        {
+            var inputEvent = new Envelope<MyOldEvent>(new MyOldEvent { MyProperty = "My-Property" });
 
+            var eventData = sut.ToEventData(inputEvent.To<IEvent>(), Guid.NewGuid(), false);
+
+            var outputEvent = sut.Parse(eventData).To<MyEvent>();
+
+            Assert.Equal(inputEvent.Payload.MyProperty, outputEvent.Payload.MyProperty);
+        }
+
+        private static void AssertPayload(Envelope<MyEvent> inputEvent, Envelope<MyEvent> outputEvent)
+        {
             Assert.Equal(inputEvent.Payload.MyProperty, outputEvent.Payload.MyProperty);
         }
 
-        private static void CompareHeaders(PropertiesBag lhs, PropertiesBag rhs)
+        private static void AssertHeaders(PropertiesBag lhs, PropertiesBag rhs)
         {
             foreach (var key in lhs.PropertyNames.Concat(rhs.PropertyNames).Distinct())
             {

tests/Squidex.Infrastructure.Tests/CQRS/Events/EventReceiverTests.cs

@@ -127,9 +127,9 @@ namespace Squidex.Infrastructure.CQRS.Events
             A.CallTo(() => eventConsumer.Name).Returns(consumerName);
             A.CallTo(() => eventConsumerInfoRepository.FindAsync(consumerName)).Returns(consumerInfo);
 
-            A.CallTo(() => formatter.Parse(eventData1)).Returns(envelope1);
+            A.CallTo(() => formatter.Parse(eventData1, true)).Returns(envelope1);
-            A.CallTo(() => formatter.Parse(eventData2)).Returns(envelope2);
+            A.CallTo(() => formatter.Parse(eventData2, true)).Returns(envelope2);
-            A.CallTo(() => formatter.Parse(eventData3)).Returns(envelope3);
+            A.CallTo(() => formatter.Parse(eventData3, true)).Returns(envelope3);
 
             sut = new EventReceiver(formatter, eventStore, eventConsumerInfoRepository, log);
         }
@@ -183,7 +183,7 @@ namespace Squidex.Infrastructure.CQRS.Events
         {
             consumerInfo.Position = "2";
 
-            A.CallTo(() => formatter.Parse(eventData2)).Throws(new InvalidOperationException());
+            A.CallTo(() => formatter.Parse(eventData2, true)).Throws(new InvalidOperationException());
 
             sut.Subscribe(eventConsumer);
             sut.Refresh();