Migrations improved

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

@@ -5,9 +5,12 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
+using System.Reflection;
+
 namespace Squidex.Domain.Apps.Core
 {
     public static class SquidexCoreModel
     {
+        public static readonly Assembly Assembly = typeof(SquidexCoreModel).Assembly;
     }
 }

src/Squidex.Domain.Apps.Entities.MongoDb/Contents/MongoContentRepository.cs

@@ -10,7 +10,6 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.OData.UriParser;
-using MongoDB.Bson;
 using MongoDB.Driver;
 using Squidex.Domain.Apps.Core.Contents;
 using Squidex.Domain.Apps.Entities.Apps;

src/Squidex.Domain.Apps.Events/SquidexEvents.cs

@@ -5,9 +5,12 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
+using System.Reflection;
+
 namespace Squidex.Domain.Apps.Events
 {
     public static class SquidexEvents
     {
+        public static readonly Assembly Assembly = typeof(SquidexEvents).Assembly;
     }
 }

src/Squidex.Infrastructure.GetEventStore/EventSourcing/ProjectionClient.cs

@@ -7,7 +7,6 @@
 
 using System;
 using System.Collections.Concurrent;
-using System.Globalization;
 using System.Linq;
 using System.Net;
 using System.Net.Sockets;
@@ -34,73 +33,65 @@ namespace Squidex.Infrastructure.EventSourcing
             this.projectionHost = projectionHost;
         }
 
-        private string CreateFilterStreamName(string filter)
+        private string CreateFilterProjectionName(string filter)
         {
-            return $"by-{StreamByFilter}-{prefix.Simplify()}-{filter.Simplify()}";
+            return $"by-{prefix.Simplify()}-{filter.Simplify()}";
         }
 
-        private string CreatePropertyStreamName(string property)
+        private string CreatePropertyProjectionName(string property)
         {
-            return $"by-{StreamByFilter}-{prefix.Simplify()}-{property.Simplify()}-property";
+            return $"by-{prefix.Simplify()}-{property.Simplify()}-property";
         }
 
         public async Task<string> CreateProjectionAsync(string property, object value)
         {
-            var streamName = CreatePropertyStreamName(property);
-
-            if (projections.TryAdd(streamName, true))
-            {
-                var projectionConfig =
-                    $@"fromAll()
-                        .when({{
-                            $any: function (s, e) {{
-                                if (e.streamId.indexOf('{prefix}') === 0 && e.data.{property}) {{
-                                    linkTo('{streamName}-' + e.data.{property}, e);
-                                }}
+            var name = CreatePropertyProjectionName(property);
+
+            var query =
+                $@"fromAll()
+                    .when({{
+                        $any: function (s, e) {{
+                            if (e.streamId.indexOf('{prefix}') === 0 && e.data.{property}) {{
+                                linkTo('{name}-' + e.data.{property}, e);
                             }}
-                        }});";
-
-                try
-                {
-                    var credentials = connection.Settings.DefaultUserCredentials;
+                        }}
+                    }});";
 
-                    await projectionsManager.CreateContinuousAsync($"{streamName}", projectionConfig, credentials);
-                }
-                catch (Exception ex)
-                {
-                    if (!ex.Is<ProjectionCommandConflictException>())
-                    {
-                        throw;
-                    }
-                }
-            }
+            await CreateProjectionAsync(name, query);
 
-            return $"{streamName}-{value}";
+            return $"{name}-{value}";
         }
 
         public async Task<string> CreateProjectionAsync(string streamFilter = null)
         {
             streamFilter = streamFilter ?? ".*";
 
-            var streamName = CreateFilterStreamName(streamFilter);
+            var name = CreateFilterProjectionName(streamFilter);
 
-            if (projections.TryAdd(streamName, true))
-            {
-                var projectionConfig =
-                    $@"fromAll()
-                        .when({{
-                            $any: function (s, e) {{
-                                if (e.streamId.indexOf('{prefix}') === 0 && /{streamFilter}/.test(e.streamId.substring({prefix.Length + 1}))) {{
-                                    linkTo('{streamName}', e);
-                                }}
+            var query =
+                $@"fromAll()
+                    .when({{
+                        $any: function (s, e) {{
+                            if (e.streamId.indexOf('{prefix}') === 0 && /{streamFilter}/.test(e.streamId.substring({prefix.Length + 1}))) {{
+                                linkTo('{name}', e);
                             }}
-                        }});";
+                        }}
+                    }});";
+
+            await CreateProjectionAsync(name, query);
 
+            return name;
+        }
+
+        private async Task CreateProjectionAsync(string name, string query)
+        {
+            if (projections.TryAdd(name, true))
+            {
                 try
                 {
                     var credentials = connection.Settings.DefaultUserCredentials;
 
-                    await projectionsManager.CreateContinuousAsync($"{streamName}", projectionConfig, credentials);
+                    await projectionsManager.CreateContinuousAsync(name, query, credentials);
                 }
                 catch (Exception ex)
                 {
@@ -110,8 +101,6 @@ namespace Squidex.Infrastructure.EventSourcing
                     }
                 }
             }
-
-            return streamName;
         }
 
         public async Task ConnectAsync()

src/Squidex.Infrastructure.MongoDb/EventSourcing/MongoEvent.cs

@@ -5,7 +5,6 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
-using System;
 using MongoDB.Bson.Serialization.Attributes;
 using Newtonsoft.Json.Linq;
 using Squidex.Infrastructure.Reflection;

src/Squidex.Infrastructure.MongoDb/EventSourcing/MongoEventStore_Writer.cs

@@ -21,18 +21,12 @@ namespace Squidex.Infrastructure.EventSourcing
 
         public Task AppendAsync(Guid commitId, string streamName, ICollection<EventData> events)
         {
-            return AppendEventsInternalAsync(commitId, streamName, EtagVersion.Any, events);
+            return AppendAsync(commitId, streamName, EtagVersion.Any, events);
         }
 
-        public Task AppendAsync(Guid commitId, string streamName, long expectedVersion, ICollection<EventData> events)
+        public async Task AppendAsync(Guid commitId, string streamName, long expectedVersion, ICollection<EventData> events)
         {
             Guard.GreaterEquals(expectedVersion, EtagVersion.Any, nameof(expectedVersion));
-
-            return AppendEventsInternalAsync(commitId, streamName, expectedVersion, events);
-        }
-
-        private async Task AppendEventsInternalAsync(Guid commitId, string streamName, long expectedVersion, ICollection<EventData> events)
-        {
             Guard.NotNullOrEmpty(streamName, nameof(streamName));
             Guard.NotNull(events, nameof(events));
 

src/Squidex.Infrastructure.MongoDb/MongoDb/MongoRepositoryBase.cs

@@ -8,7 +8,6 @@
 using System;
 using System.Globalization;
 using System.Threading.Tasks;
-using MongoDB.Bson;
 using MongoDB.Driver;
 using Squidex.Infrastructure.Tasks;
 

src/Squidex.Infrastructure/EventSourcing/DefaultEventDataFormatter.cs

@@ -30,7 +30,7 @@ namespace Squidex.Infrastructure.EventSourcing
             var eventType = typeNameRegistry.GetType(eventData.Type);
 
             var headers = eventData.Metadata.ToObject<EnvelopeHeaders>();
-            var content = eventData.Metadata.ToObject(eventType, serializer) as IEvent;
+            var content = eventData.Payload.ToObject(eventType, serializer) as IEvent;
 
             if (migrate && content is IMigratedEvent migratedEvent)
             {

src/Squidex.Infrastructure/Migrations/IMigration.cs

@@ -5,17 +5,12 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
-using System.Collections.Generic;
 using System.Threading.Tasks;
 
 namespace Squidex.Infrastructure.Migrations
 {
     public interface IMigration
     {
-        int FromVersion { get; }
-
-        int ToVersion { get; }
-
-        Task UpdateAsync(IEnumerable<IMigration> previousMigrations);
+        Task UpdateAsync();
     }
 }

src/Squidex.Infrastructure/Migrations/IMigrationPath.cs

@@ -0,0 +1,16 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using System.Collections.Generic;
+
+namespace Squidex.Infrastructure.Migrations
+{
+    public interface IMigrationPath
+    {
+        (int Version, IEnumerable<IMigration> Migrations) GetNext(int version);
+    }
+}

src/Squidex.Infrastructure/Migrations/Migrator.cs

@@ -5,8 +5,6 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
-using System;
-using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using Squidex.Infrastructure.Log;
@@ -15,20 +13,20 @@ namespace Squidex.Infrastructure.Migrations
 {
     public sealed class Migrator
     {
-        private readonly IMigrationStatus migrationStatus;
-        private readonly IEnumerable<IMigration> migrations;
         private readonly ISemanticLog log;
+        private readonly IMigrationStatus migrationStatus;
+        private readonly IMigrationPath migrationPath;
 
         public int LockWaitMs { get; set; } = 5000;
 
-        public Migrator(IMigrationStatus migrationStatus, IEnumerable<IMigration> migrations, ISemanticLog log)
+        public Migrator(IMigrationStatus migrationStatus, IMigrationPath migrationPath, ISemanticLog log)
         {
             Guard.NotNull(migrationStatus, nameof(migrationStatus));
-            Guard.NotNull(migrations, nameof(migrations));
+            Guard.NotNull(migrationPath, nameof(migrationPath));
             Guard.NotNull(log, nameof(log));
 
             this.migrationStatus = migrationStatus;
-            this.migrations = migrations.OrderByDescending(x => x.ToVersion).ToList();
+            this.migrationPath = migrationPath;
 
             this.log = log;
         }
@@ -39,8 +37,6 @@ namespace Squidex.Infrastructure.Migrations
 
             try
             {
-                var lastMigrator = migrations.FirstOrDefault();
-
                 while (!await migrationStatus.TryLockAsync())
                 {
                     log.LogInformation(w => w
@@ -52,13 +48,16 @@ namespace Squidex.Infrastructure.Migrations
 
                 version = await migrationStatus.GetVersionAsync();
 
-                if (lastMigrator != null && lastMigrator.ToVersion != version)
+                while (true)
                 {
-                    var migrationPath = FindMigratorPath(version, lastMigrator.ToVersion).ToList();
+                    var migrationStep = migrationPath.GetNext(version);
 
-                    var previousMigrations = new List<IMigration>();
+                    if (migrationStep.Migrations == null || !migrationStep.Migrations.Any())
+                    {
+                        break;
+                    }
 
-                    foreach (var migration in migrationPath)
+                    foreach (var migration in migrationStep.Migrations)
                     {
                         var name = migration.GetType().ToString();
 
@@ -72,13 +71,11 @@ namespace Squidex.Infrastructure.Migrations
                             .WriteProperty("status", "Completed")
                             .WriteProperty("migrator", name)))
                         {
-                            await migration.UpdateAsync(previousMigrations.ToList());
-
-                            version = migration.ToVersion;
+                            await migration.UpdateAsync();
                         }
-
-                        previousMigrations.Add(migration);
                     }
+
+                    version = migrationStep.Version;
                 }
             }
             finally
@@ -86,30 +83,5 @@ namespace Squidex.Infrastructure.Migrations
                 await migrationStatus.UnlockAsync(version);
             }
         }
-
-        private IEnumerable<IMigration> FindMigratorPath(int fromVersion, int toVersion)
-        {
-            var addedMigrators = new HashSet<IMigration>();
-
-            while (true)
-            {
-                var bestMigrator = migrations.Where(x => x.FromVersion < x.ToVersion).FirstOrDefault(x => x.FromVersion == fromVersion);
-
-                if (bestMigrator != null && addedMigrators.Add(bestMigrator))
-                {
-                    fromVersion = bestMigrator.ToVersion;
-
-                    yield return bestMigrator;
-                }
-                else if (fromVersion != toVersion)
-                {
-                    throw new InvalidOperationException($"There is no migration path from {fromVersion} to {toVersion}.");
-                }
-                else
-                {
-                    break;
-                }
-            }
-        }
     }
 }

src/Squidex.Infrastructure/SquidexInfrastructure.cs

@@ -5,9 +5,12 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
+using System.Reflection;
+
 namespace Squidex.Infrastructure
 {
     public static class SquidexInfrastructure
     {
+        public static readonly Assembly Assembly = typeof(SquidexInfrastructure).Assembly;
     }
 }

src/Squidex/Config/Domain/SerializationServices.cs

@@ -28,10 +28,10 @@ namespace Squidex.Config.Domain
     {
         private static readonly TypeNameRegistry TypeNameRegistry =
             new TypeNameRegistry()
-                .MapUnmapped(typeof(Migration01_FromCqrs).Assembly)
-                .MapUnmapped(typeof(SquidexCoreModel).Assembly)
-                .MapUnmapped(typeof(SquidexEvents).Assembly)
-                .MapUnmapped(typeof(SquidexInfrastructure).Assembly);
+                .MapUnmapped(SquidexCoreModel.Assembly)
+                .MapUnmapped(SquidexEvents.Assembly)
+                .MapUnmapped(SquidexInfrastructure.Assembly)
+                .MapUnmapped(SquidexMigrations.Assembly);
 
         private static readonly FieldRegistry FieldRegistry = new FieldRegistry(TypeNameRegistry);
 

src/Squidex/Config/Domain/WriteServices.cs

@@ -9,6 +9,7 @@ using System;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Options;
 using Migrate_01;
+using Migrate_01.Migrations;
 using Squidex.Domain.Apps.Core.Apps;
 using Squidex.Domain.Apps.Core.Scripting;
 using Squidex.Domain.Apps.Entities.Apps;
@@ -63,13 +64,19 @@ namespace Squidex.Config.Domain
             services.AddSingletonAs<RuleCommandMiddleware>()
                 .As<ICommandMiddleware>();
 
-            services.AddTransientAs<Migration01_FromCqrs>()
+            services.AddTransientAs<MigrationPath>()
+                .As<IMigrationPath>();
+
+            services.AddTransientAs<AddPatterns>()
+                .As<IMigration>();
+
+            services.AddTransientAs<ConvertEventStore>()
                 .As<IMigration>();
 
-            services.AddTransientAs<Migration02_AddPatterns>()
+            services.AddTransientAs<RebuildContentCollections>()
                 .As<IMigration>();
 
-            services.AddTransientAs<Migration03_SplitContentCollections>()
+            services.AddTransientAs<RebuildSnapshots>()
                 .As<IMigration>();
 
             services.AddTransientAs<Rebuilder>()

tests/Squidex.Infrastructure.Tests/EventSourcing/EventDataFormatterTests.cs → tests/Squidex.Infrastructure.Tests/EventSourcing/DefaultEventDataFormatterTests.cs

@@ -15,7 +15,7 @@ using Xunit;
 
 namespace Squidex.Infrastructure.EventSourcing
 {
-    public class EventDataFormatterTests
+    public class DefaultEventDataFormatterTests
     {
         public sealed class MyOldEvent : IEvent, IMigratedEvent
         {
@@ -31,7 +31,7 @@ namespace Squidex.Infrastructure.EventSourcing
         private readonly TypeNameRegistry typeNameRegistry = new TypeNameRegistry();
         private readonly DefaultEventDataFormatter sut;
 
-        public EventDataFormatterTests()
+        public DefaultEventDataFormatterTests()
         {
             serializerSettings.Converters.Add(new PropertiesBagConverter<EnvelopeHeaders>());
 

tests/Squidex.Infrastructure.Tests/Migrations/MigratorTests.cs

@@ -19,7 +19,9 @@ namespace Squidex.Infrastructure.Migrations
     public sealed class MigratorTests
     {
         private readonly IMigrationStatus status = A.Fake<IMigrationStatus>();
+        private readonly IMigrationPath path = A.Fake<IMigrationPath>();
         private readonly ISemanticLog log = A.Fake<ISemanticLog>();
+        private readonly List<(int From, int To, IMigration Migration)> migrations = new List<(int From, int To, IMigration Migration)>();
 
         public sealed class InMemoryStatus : IMigrationStatus
         {
@@ -64,6 +66,14 @@ namespace Squidex.Infrastructure.Migrations
 
         public MigratorTests()
         {
+            A.CallTo(() => path.GetNext(A<int>.Ignored))
+                .ReturnsLazily((int v) =>
+                {
+                    var m = migrations.Where(x => x.From == v).ToList();
+
+                    return m.Count == 0 ? (0, null) : (migrations.Max(x => x.To), migrations.Select(x => x.Migration));
+                });
+
             A.CallTo(() => status.GetVersionAsync()).Returns(0);
             A.CallTo(() => status.TryLockAsync()).Returns(true);
         }
@@ -75,13 +85,13 @@ namespace Squidex.Infrastructure.Migrations
             var migrator_1_2 = BuildMigration(1, 2);
             var migrator_2_3 = BuildMigration(2, 3);
 
-            var migrator = new Migrator(status, new[] { migrator_0_1, migrator_1_2, migrator_2_3 }, log);
+            var sut = new Migrator(status, path, log);
 
-            await migrator.MigrateAsync();
+            await sut.MigrateAsync();
 
-            A.CallTo(() => migrator_0_1.UpdateAsync(A<IEnumerable<IMigration>>.That.IsEmpty())).MustHaveHappened();
-            A.CallTo(() => migrator_1_2.UpdateAsync(A<IEnumerable<IMigration>>.That.IsSameSequenceAs(migrator_0_1))).MustHaveHappened();
-            A.CallTo(() => migrator_2_3.UpdateAsync(A<IEnumerable<IMigration>>.That.IsSameSequenceAs(migrator_0_1, migrator_1_2))).MustHaveHappened();
+            A.CallTo(() => migrator_0_1.UpdateAsync()).MustHaveHappened();
+            A.CallTo(() => migrator_1_2.UpdateAsync()).MustHaveHappened();
+            A.CallTo(() => migrator_2_3.UpdateAsync()).MustHaveHappened();
 
             A.CallTo(() => status.UnlockAsync(3)).MustHaveHappened();
         }
@@ -93,51 +103,15 @@ namespace Squidex.Infrastructure.Migrations
             var migrator_1_2 = BuildMigration(1, 2);
             var migrator_2_3 = BuildMigration(2, 3);
 
-            var migrator = new Migrator(status, new[] { migrator_0_1, migrator_1_2, migrator_2_3 }, log);
-
-            A.CallTo(() => migrator_1_2.UpdateAsync(A<IEnumerable<IMigration>>.Ignored)).Throws(new ArgumentException());
-
-            await Assert.ThrowsAsync<ArgumentException>(migrator.MigrateAsync);
-
-            A.CallTo(() => migrator_0_1.UpdateAsync(A<IEnumerable<IMigration>>.That.IsEmpty())).MustHaveHappened();
-            A.CallTo(() => migrator_1_2.UpdateAsync(A<IEnumerable<IMigration>>.That.IsSameSequenceAs(migrator_0_1))).MustHaveHappened();
-            A.CallTo(() => migrator_2_3.UpdateAsync(A<IEnumerable<IMigration>>.Ignored)).MustNotHaveHappened();
-
-            A.CallTo(() => status.UnlockAsync(1)).MustHaveHappened();
-        }
-
-        [Fact]
-        public async Task Should_migrate_with_fastest_path()
-        {
-            var migrator_0_1 = BuildMigration(0, 1);
-            var migrator_0_2 = BuildMigration(0, 2);
-            var migrator_1_2 = BuildMigration(1, 2);
-            var migrator_2_3 = BuildMigration(2, 3);
-
-            var migrator = new Migrator(status, new[] { migrator_0_1, migrator_0_2, migrator_1_2, migrator_2_3 }, log);
-
-            await migrator.MigrateAsync();
-
-            A.CallTo(() => migrator_0_2.UpdateAsync(A<IEnumerable<IMigration>>.That.IsEmpty())).MustHaveHappened();
-            A.CallTo(() => migrator_0_1.UpdateAsync(A<IEnumerable<IMigration>>.Ignored)).MustNotHaveHappened();
-            A.CallTo(() => migrator_1_2.UpdateAsync(A<IEnumerable<IMigration>>.Ignored)).MustNotHaveHappened();
-            A.CallTo(() => migrator_2_3.UpdateAsync(A<IEnumerable<IMigration>>.That.IsSameSequenceAs(migrator_0_2))).MustHaveHappened();
-
-            A.CallTo(() => status.UnlockAsync(3)).MustHaveHappened();
-        }
-
-        [Fact]
-        public async Task Should_throw_if_no_path_found()
-        {
-            var migrator_0_1 = BuildMigration(0, 1);
-            var migrator_2_3 = BuildMigration(2, 3);
+            var sut = new Migrator(status, path, log);
 
-            var migrator = new Migrator(status, new[] { migrator_0_1, migrator_2_3 }, log);
+            A.CallTo(() => migrator_1_2.UpdateAsync()).Throws(new ArgumentException());
 
-            await Assert.ThrowsAsync<InvalidOperationException>(migrator.MigrateAsync);
+            await Assert.ThrowsAsync<ArgumentException>(sut.MigrateAsync);
 
-            A.CallTo(() => migrator_0_1.UpdateAsync(A<IEnumerable<IMigration>>.Ignored)).MustNotHaveHappened();
-            A.CallTo(() => migrator_2_3.UpdateAsync(A<IEnumerable<IMigration>>.Ignored)).MustNotHaveHappened();
+            A.CallTo(() => migrator_0_1.UpdateAsync()).MustHaveHappened();
+            A.CallTo(() => migrator_1_2.UpdateAsync()).MustHaveHappened();
+            A.CallTo(() => migrator_2_3.UpdateAsync()).MustNotHaveHappened();
 
             A.CallTo(() => status.UnlockAsync(0)).MustHaveHappened();
         }
@@ -148,20 +122,19 @@ namespace Squidex.Infrastructure.Migrations
             var migrator_0_1 = BuildMigration(0, 1);
             var migrator_1_2 = BuildMigration(1, 2);
 
-            var migrator = new Migrator(new InMemoryStatus(), new[] { migrator_0_1, migrator_1_2 }, log) { LockWaitMs = 2 };
+            var sut = new Migrator(new InMemoryStatus(), path, log) { LockWaitMs = 2 };
 
-            await Task.WhenAll(Enumerable.Repeat(0, 10).Select(x => Task.Run(migrator.MigrateAsync)));
+            await Task.WhenAll(Enumerable.Repeat(0, 10).Select(x => Task.Run(sut.MigrateAsync)));
 
-            A.CallTo(() => migrator_0_1.UpdateAsync(A<IEnumerable<IMigration>>.Ignored)).MustHaveHappened(Repeated.Exactly.Once);
-            A.CallTo(() => migrator_1_2.UpdateAsync(A<IEnumerable<IMigration>>.Ignored)).MustHaveHappened(Repeated.Exactly.Once);
+            A.CallTo(() => migrator_0_1.UpdateAsync()).MustHaveHappened(Repeated.Exactly.Once);
+            A.CallTo(() => migrator_1_2.UpdateAsync()).MustHaveHappened(Repeated.Exactly.Once);
         }
 
         private IMigration BuildMigration(int fromVersion, int toVersion)
         {
             var migration = A.Fake<IMigration>();
 
-            A.CallTo(() => migration.FromVersion).Returns(fromVersion);
-            A.CallTo(() => migration.ToVersion).Returns(toVersion);
+            migrations.Add((fromVersion, toVersion, migration));
 
             return migration;
         }

tools/Migrate_01/Migrate_01.csproj

@@ -6,6 +6,7 @@
     <ProjectReference Include="..\..\src\Squidex.Domain.Apps.Core.Model\Squidex.Domain.Apps.Core.Model.csproj" />
     <ProjectReference Include="..\..\src\Squidex.Domain.Apps.Entities\Squidex.Domain.Apps.Entities.csproj" />
     <ProjectReference Include="..\..\src\Squidex.Domain.Apps.Events\Squidex.Domain.Apps.Events.csproj" />
+    <ProjectReference Include="..\..\src\Squidex.Infrastructure.MongoDb\Squidex.Infrastructure.MongoDb.csproj" />
     <ProjectReference Include="..\..\src\Squidex.Infrastructure\Squidex.Infrastructure.csproj" />
   </ItemGroup>
   <PropertyGroup>

tools/Migrate_01/MigrationPath.cs

@@ -0,0 +1,64 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using System;
+using System.Collections.Generic;
+using Microsoft.Extensions.DependencyInjection;
+using Migrate_01.Migrations;
+using Squidex.Infrastructure.Migrations;
+
+namespace Migrate_01
+{
+    public class MigrationMatrix
+    {
+        private readonly IServiceProvider serviceProvider;
+
+        public MigrationMatrix(IServiceProvider serviceProvider)
+        {
+            this.serviceProvider = serviceProvider;
+        }
+
+        public (int Version, IEnumerable<IMigration> Migrations) MigrationPath(int version)
+        {
+            switch (version)
+            {
+                case 0:
+                    return (4,
+                        new IMigration[]
+                        {
+                            serviceProvider.GetRequiredService<ConvertEventStore>(),
+                            serviceProvider.GetRequiredService<RebuildSnapshots>(),
+                            serviceProvider.GetRequiredService<AddPatterns>()
+                        });
+                case 1:
+                    return (4,
+                        new IMigration[]
+                        {
+                            serviceProvider.GetRequiredService<ConvertEventStore>(),
+                            serviceProvider.GetRequiredService<AddPatterns>(),
+                            serviceProvider.GetRequiredService<RebuildContentCollections>()
+                        });
+                case 2:
+                    return (4,
+                        new IMigration[]
+                        {
+                            serviceProvider.GetRequiredService<ConvertEventStore>(),
+                            serviceProvider.GetRequiredService<AddPatterns>(),
+                            serviceProvider.GetRequiredService<RebuildContentCollections>()
+                        });
+                case 3:
+                    return (4,
+                        new IMigration[]
+                        {
+                            serviceProvider.GetRequiredService<ConvertEventStore>()
+                        });
+            }
+
+            return (0, null);
+        }
+    }
+}

tools/Migrate_01/Migration02_AddPatterns.cs → tools/Migrate_01/Migrations/AddPatterns.cs

@@ -6,7 +6,6 @@
 // ==========================================================================
 
 using System;
-using System.Collections.Generic;
 using System.Threading.Tasks;
 using Squidex.Domain.Apps.Entities.Apps;
 using Squidex.Domain.Apps.Entities.Apps.Commands;
@@ -15,26 +14,22 @@ using Squidex.Infrastructure;
 using Squidex.Infrastructure.Migrations;
 using Squidex.Infrastructure.States;
 
-namespace Migrate_01
+namespace Migrate_01.Migrations
 {
-    public sealed class Migration02_AddPatterns : IMigration
+    public sealed class AddPatterns : IMigration
     {
         private readonly InitialPatterns initialPatterns;
         private readonly IStateFactory stateFactory;
         private readonly IAppRepository appRepository;
 
-        public int FromVersion { get; } = 1;
-
-        public int ToVersion { get; } = 2;
-
-        public Migration02_AddPatterns(InitialPatterns initialPatterns, IAppRepository appRepository, IStateFactory stateFactory)
+        public AddPatterns(InitialPatterns initialPatterns, IAppRepository appRepository, IStateFactory stateFactory)
         {
             this.initialPatterns = initialPatterns;
             this.appRepository = appRepository;
             this.stateFactory = stateFactory;
         }
 
-        public async Task UpdateAsync(IEnumerable<IMigration> previousMigrations)
+        public async Task UpdateAsync()
         {
             var ids = await appRepository.QueryAppIdsAsync();
 

tools/Migrate_01/Migration00_ConvertEventStore.cs → tools/Migrate_01/Migrations/ConvertEventStore.cs

@@ -5,29 +5,24 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
-using System.Collections.Generic;
 using System.Threading.Tasks;
 using MongoDB.Bson;
 using MongoDB.Driver;
 using Squidex.Infrastructure.EventSourcing;
 using Squidex.Infrastructure.Migrations;
 
-namespace Migrate_01
+namespace Migrate_01.Migrations
 {
-    public sealed class Migration00_ConvertEventStore : IMigration
+    public sealed class ConvertEventStore : IMigration
     {
         private readonly IEventStore eventStore;
 
-        public int FromVersion { get; } = 0;
-
-        public int ToVersion { get; } = 1;
-
-        public Migration00_ConvertEventStore(IEventStore eventStore)
+        public ConvertEventStore(IEventStore eventStore)
         {
             this.eventStore = eventStore;
         }
 
-        public async Task UpdateAsync(IEnumerable<IMigration> previousMigrations)
+        public async Task UpdateAsync()
         {
             if (eventStore is MongoEventStore mongoEventStore)
             {

tools/Migrate_01/Migration03_SplitContentCollections.cs → tools/Migrate_01/Migrations/RebuildContentCollections.cs

@@ -5,32 +5,23 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
-using System.Collections.Generic;
-using System.Linq;
 using System.Threading.Tasks;
 using Squidex.Infrastructure.Migrations;
 
-namespace Migrate_01
+namespace Migrate_01.Migrations
 {
-    public class Migration03_SplitContentCollections : IMigration
+    public class RebuildContentCollections : IMigration
     {
         private readonly Rebuilder rebuilder;
 
-        public int FromVersion { get; } = 2;
-
-        public int ToVersion { get; } = 3;
-
-        public Migration03_SplitContentCollections(Rebuilder rebuilder)
+        public RebuildContentCollections(Rebuilder rebuilder)
         {
             this.rebuilder = rebuilder;
         }
 
-        public async Task UpdateAsync(IEnumerable<IMigration> previousMigrations)
+        public Task UpdateAsync()
         {
-            if (!previousMigrations.Any(x => x is Migration01_FromCqrs))
-            {
-                await rebuilder.RebuildContentAsync();
-            }
+            return rebuilder.RebuildContentAsync();
         }
     }
 }

tools/Migrate_01/Migration01_FromCqrs.cs → tools/Migrate_01/Migrations/RebuildSnapshots.cs

@@ -5,26 +5,21 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
-using System.Collections.Generic;
 using System.Threading.Tasks;
 using Squidex.Infrastructure.Migrations;
 
-namespace Migrate_01
+namespace Migrate_01.Migrations
 {
-    public sealed class Migration01_FromCqrs : IMigration
+    public sealed class RebuildSnapshots : IMigration
     {
         private readonly Rebuilder rebuilder;
 
-        public int FromVersion { get; } = 0;
-
-        public int ToVersion { get; } = 1;
-
-        public Migration01_FromCqrs(Rebuilder rebuilder)
+        public RebuildSnapshots(Rebuilder rebuilder)
         {
             this.rebuilder = rebuilder;
         }
 
-        public async Task UpdateAsync(IEnumerable<IMigration> previousMigrations)
+        public async Task UpdateAsync()
         {
             await rebuilder.RebuildConfigAsync();
             await rebuilder.RebuildContentAsync();

tools/Migrate_01/SquidexMigrations.cs

@@ -0,0 +1,16 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using System.Reflection;
+
+namespace Migrate_01
+{
+    public static class SquidexMigrations
+    {
+        public static readonly Assembly Assembly = typeof(SquidexMigrations).Assembly;
+    }
+}