ABP 8 to 10 Upgrade MongoDb Guid format #10608

3 Answer(s)

• 

  0

  AI-Bot created 5 months ago

  Support Team ABP Agent

  • In ABP 10 (MongoDB.Driver 3.x), the driver expects UuidStandard by default, while your existing documents (created with older driver versions) often contain UuidLegacy. That’s why you see problems specifically when deserializing existing Entity<Guid>.Id values.
  • Fix: force the application to use the legacy GUID representation globally (both read & write) by registering a convention that uses GuidRepresentation.CSharpLegacy for Guid and Guid?, and register it once at application startup, before any MongoDB class maps/serializers are used.

  Add this to your *.MongoDb module (e.g. YourProjectMongoDbModule) ConfigureServices:

  using MongoDB.Bson;
  using MongoDB.Bson.Serialization.Conventions;
  using Volo.Abp.Modularity;
  
  public class YourProjectMongoDbModule : AbpModule
  {
      public override void ConfigureServices(ServiceConfigurationContext context)
      {
          // Important for MongoDB.Driver v3.x+
          BsonDefaults.GuidRepresentationMode = GuidRepresentationMode.V3;
  
          // Register once (avoid duplicate registration on hot-reload/tests)
          if (!ConventionRegistry.Lookup("LegacyGuidConvention").Any())
          {
              var pack = new ConventionPack
              {
                  new LegacyGuidConvention()
              };
  
              ConventionRegistry.Register(
                  "LegacyGuidConvention",
                  pack,
                  _ => true
              );
          }
      }
  }
  

  And use this convention implementation:

  using MongoDB.Bson;
  using MongoDB.Bson.Serialization;
  using MongoDB.Bson.Serialization.Conventions;
  using MongoDB.Bson.Serialization.Serializers;
  using System;
  
  public class LegacyGuidConvention : ConventionBase, IMemberMapConvention
  {
      public void Apply(BsonMemberMap memberMap)
      {
          if (memberMap.MemberType == typeof(Guid))
          {
              memberMap.SetSerializer(new GuidSerializer(GuidRepresentation.CSharpLegacy));
          }
          else if (memberMap.MemberType == typeof(Guid?))
          {
              var guidSerializer = new GuidSerializer(GuidRepresentation.CSharpLegacy);
              memberMap.SetSerializer(new NullableSerializer<Guid>(guidSerializer));
          }
      }
  }
  

  This makes ABP’s Id (and any other Guid fields) continue to be stored/read in the old (CSharpLegacy) format, so existing documents deserialize correctly and new inserts remain compatible with your current database.

  • https://abp.io/docs/latest/release-info/migration-guides/MongoDB-Driver-2-to-3
  • https://abp.io/community/articles/solving-mongodb-guid-issues-after-an-abp-framework-upgrade-tv8waw1n

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  0

  DominaTang created 5 months ago

  BsonDefaults does not contain a defintiion for GuidRepresentationMode

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• 

  0

  AI-Bot created 5 months ago

  Support Team ABP Agent

  • BsonDefaults.GuidRepresentationMode was part of older driver APIs. In MongoDB.Driver 3.x (used by ABP 9.2+ / ABP 10), that property is not available, so your compile error is expected.
  • For ABP + MongoDB.Driver 3.x, the supported way (and the one ABP guidance uses) is to register serializers via conventions (like your LegacyGuidConvention) so Guid fields (including ABP Entity<Guid>.Id) are read/written using the legacy representation.

  Use only the convention-based fix (remove BsonDefaults.GuidRepresentationMode entirely) and ensure it runs very early (in your *.MongoDb module PreConfigureServices so it happens before Mongo mappings initialize):

  using MongoDB.Bson.Serialization.Conventions;
  using Volo.Abp.Modularity;
  
  public class YourProjectMongoDbModule : AbpModule
  {
      public override void PreConfigureServices(ServiceConfigurationContext context)
      {
          var conventionPack = new ConventionPack { new LegacyGuidConvention() };
  
          ConventionRegistry.Register(
              "LegacyGuidConvention",
              conventionPack,
              _ => true);
      }
  }
  

  And LegacyGuidConvention should set GuidSerializer(GuidRepresentation.CSharpLegacy) for Guid and Guid? (as in the ABP community article you referenced earlier).

  If you had already run the app (or tests) without the convention, restart the process after adding this (MongoDB serialization conventions/class maps are effectively “startup-time” decisions).

  Links (verified):

  • https://abp.io/docs/latest/release-info/migration-guides/MongoDB-Driver-2-to-3
  • https://abp.io/community/articles/solving-mongodb-guid-issues-after-an-abp-framework-upgrade-tv8waw1n

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