Improve entity history handling for shared types and JSON

Enhanced EntityHistoryHelper to correctly handle entities with shared CLR types and properties mapped to JSON. Added logic to determine property type from entry values when the type is object, and improved property change tracking for JSON-mapped navigation properties.

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/EntityHistory/EntityHistoryHelper.cs

@@ -5,6 +5,7 @@ using System.Linq;
 using System.Reflection;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.ChangeTracking;
+using Microsoft.EntityFrameworkCore.Metadata;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Logging.Abstractions;
 using Microsoft.Extensions.Options;
@@ -108,12 +109,17 @@ public class EntityHistoryHelper : IEntityHistoryHelper, ITransientDependency
         }
 
         var entityType = entity.GetType();
+        var entityFullName = entityType.FullName!;
+        if (entityEntry.Metadata.HasSharedClrType)
+        {
+            entityFullName = entityEntry.Metadata.Name;
+        }
         var entityChange = new EntityChangeInfo
         {
             ChangeType = changeType,
             EntityEntry = entityEntry,
             EntityId = entityId,
-            EntityTypeFullName = entityType.FullName,
+            EntityTypeFullName = entityFullName,
             PropertyChanges = GetPropertyChanges(entityEntry),
             EntityTenantId = GetTenantId(entity)
         };
@@ -184,12 +190,14 @@ public class EntityHistoryHelper : IEntityHistoryHelper, ITransientDependency
             var propertyEntry = entityEntry.Property(property.Name);
             if (ShouldSavePropertyHistory(propertyEntry, isCreated || isDeleted) && !IsSoftDeleted(entityEntry))
             {
+                var propertyType = DeterminePropertyTypeFromEntry(property, propertyEntry);
+
                 propertyChanges.Add(new EntityPropertyChangeInfo
                 {
                     NewValue = isDeleted ? null : JsonSerializer.Serialize(propertyEntry.CurrentValue!).TruncateWithPostfix(EntityPropertyChangeInfo.MaxValueLength),
                     OriginalValue = isCreated ? null : JsonSerializer.Serialize(propertyEntry.OriginalValue!).TruncateWithPostfix(EntityPropertyChangeInfo.MaxValueLength),
                     PropertyName = property.Name,
-                    PropertyTypeFullName = property.ClrType.GetFirstGenericArgumentIfNullable().FullName!
+                    PropertyTypeFullName = propertyType.FullName!
                 });
             }
         }
@@ -208,14 +216,22 @@ public class EntityHistoryHelper : IEntityHistoryHelper, ITransientDependency
                 if (AbpEfCoreNavigationHelper.IsNavigationEntryModified(entityEntry, index))
                 {
                     var abpNavigationEntry = AbpEfCoreNavigationHelper.GetNavigationEntry(entityEntry, index);
-                    var isCollection = navigationEntry.Metadata.IsCollection;
-                    propertyChanges.Add(new EntityPropertyChangeInfo
+                    if (navigationEntry.Metadata.TargetEntityType.IsMappedToJson() && navigationEntry is ReferenceEntry referenceEntry && referenceEntry.TargetEntry != null)
+                    {
+                        var jsonPropertyChanges = GetPropertyChanges(referenceEntry.TargetEntry);
+                        propertyChanges.AddRange(jsonPropertyChanges);
+                    }
+                    else
                     {
-                        PropertyName = navigationEntry.Metadata.Name,
-                        PropertyTypeFullName = navigationEntry.Metadata.ClrType.GetFirstGenericArgumentIfNullable().FullName!,
-                        OriginalValue = GetNavigationPropertyValue(abpNavigationEntry?.OriginalValue, isCollection),
-                        NewValue = GetNavigationPropertyValue(abpNavigationEntry?.CurrentValue, isCollection)
-                    });
+                        var isCollection = navigationEntry.Metadata.IsCollection;
+                        propertyChanges.Add(new EntityPropertyChangeInfo
+                        {
+                            PropertyName = navigationEntry.Metadata.Name,
+                            PropertyTypeFullName = navigationEntry.Metadata.ClrType.GetFirstGenericArgumentIfNullable().FullName!,
+                            OriginalValue = GetNavigationPropertyValue(abpNavigationEntry?.OriginalValue, isCollection),
+                            NewValue = GetNavigationPropertyValue(abpNavigationEntry?.CurrentValue, isCollection)
+                        });
+                    }
                 }
             }
         }
@@ -223,6 +239,27 @@ public class EntityHistoryHelper : IEntityHistoryHelper, ITransientDependency
         return propertyChanges;
     }
 
+    protected virtual Type DeterminePropertyTypeFromEntry(IProperty property, PropertyEntry propertyEntry)
+    {
+        var propertyType = property.ClrType.GetFirstGenericArgumentIfNullable();
+
+        if (propertyType != typeof(object))
+        {
+            return propertyType;
+        }
+
+        if (propertyEntry.CurrentValue != null)
+        {
+            propertyType = propertyEntry.CurrentValue.GetType().GetFirstGenericArgumentIfNullable();
+        }
+        else if (propertyEntry.OriginalValue != null)
+        {
+            propertyType = propertyEntry.OriginalValue.GetType().GetFirstGenericArgumentIfNullable();
+        }
+
+        return propertyType;
+    }
+
     protected virtual string? GetNavigationPropertyValue(object? entity, bool isCollection)
     {
         switch (entity)