Migration improved again.

backend/src/Squidex.Web/Json/TypedJsonInheritanceConverter.cs

@@ -69,7 +69,7 @@ namespace Squidex.Web.Json
             return result;
         });
 
-        private readonly IReadOnlyDictionary<string, Type> maping;
+        private readonly IReadOnlyDictionary<string, Type> mapping;
 
         public TypedJsonInheritanceConverter(string discriminator)
             : this(discriminator, DefaultMapping.Value)
@@ -79,17 +79,17 @@ namespace Squidex.Web.Json
         public TypedJsonInheritanceConverter(string discriminator, IReadOnlyDictionary<string, Type> mapping)
             : base(typeof(T), discriminator)
         {
-            maping = mapping ?? DefaultMapping.Value;
+            this.mapping = mapping ?? TypedJsonInheritanceConverter<T>.DefaultMapping.Value;
         }
 
         protected override Type GetDiscriminatorType(JObject jObject, Type objectType, string discriminatorValue)
         {
-            return maping.GetOrDefault(discriminatorValue) ?? throw new InvalidOperationException($"Could not find subtype of '{objectType.Name}' with discriminator '{discriminatorValue}'.");
+            return mapping.GetOrDefault(discriminatorValue) ?? throw new InvalidOperationException($"Could not find subtype of '{objectType.Name}' with discriminator '{discriminatorValue}'.");
         }
 
         public override string GetDiscriminatorValue(Type type)
         {
-            return maping.FirstOrDefault(x => x.Value == type).Key ?? type.Name;
+            return mapping.FirstOrDefault(x => x.Value == type).Key ?? type.Name;
         }
     }
 }

backend/tools/Migrate_01/Migrations/MongoDb/RenameAssetMetadata.cs

@@ -31,6 +31,13 @@ namespace Migrate_01.Migrations.MongoDb
 
             await collection.UpdateManyAsync(new BsonDocument(), createMetadata);
 
+            var removeNullPixelInfos =
+                Builders<BsonDocument>.Update
+                    .Unset("ph")
+                    .Unset("pw");
+
+            await collection.UpdateManyAsync(new BsonDocument("ph", BsonValue.Create(null)), removeNullPixelInfos);
+
             var setPixelDimensions =
                 Builders<BsonDocument>.Update
                     .Rename("ph", "md.pixelHeight")