EFCore 3 generate update for seed data in every migrations

Question

After updating my project from dotnet core 2.2 to 3.1. Now, after running migrations add command, new migration contains update for all seed data.

public class MyEntity
{
    public Guid Id { get; private set; }
    public string Code { get; private set; }
    public string Title { get; private set; }
    public bool IsActive { get; private set; }

    private MyEntity() { }

    [JsonConstructor]
    public MyEntity(Guid id, string code, string title)
    {
        Id = id;
        Title = title;
        Code = code;
        IsActive = true;
    }
}

public class MyEntityEntityTypeConfiguration
      : IEntityTypeConfiguration<MyEntity>
{
    public void Configure(EntityTypeBuilder<MyEntity> configuration)
    {
        configuration.HasKey(b => b.Id);

        configuration.Property(b => b.Title).HasMaxLength(150).IsRequired();

        configuration.Property(b => b.Code).HasMaxLength(20).IsRequired();

        configuration.Property(c => c.IsActive).HasDefaultValue(true);

        configuration.HasData(
            new MyEntity(new Guid("3274D8FD-DFAE-4396-8DD0-89A6F5107DB1"), "1", "titl1")
            );
    }
}

and this is unwanted part of migration, this code exist in all feature migrations.

        migrationBuilder.UpdateData(
            schema: "dbo",
            table: "MyEntity",
            keyColumn: "Id",
            keyValue: new Guid("08f2aa3d-ad4c-4a82-987c-ff43527466e0"),
            column: "IsActive",
            value: true);

I didn't have this update before updating to dotnet core 3.1. What is changed?

Answer 1

This issue is being tracked here.

A work around I'm using in my own project to ignore all seed data updates;

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Usage", "EF1001:Internal EF Core API usage.", Justification = "Workaround")]
    public class ModelDiffer : MigrationsModelDiffer
    {
        public ModelDiffer(
            IRelationalTypeMappingSource typeMappingSource, 
            IMigrationsAnnotationProvider migrationsAnnotations, 
            IChangeDetector changeDetector,
            IUpdateAdapterFactory updateAdapterFactory, 
            CommandBatchPreparerDependencies commandBatchPreparerDependencies) :
            base(typeMappingSource, migrationsAnnotations, changeDetector, updateAdapterFactory, commandBatchPreparerDependencies)
        {
        }
        //FIXME Remove when https://github.com/aspnet/EntityFrameworkCore/issues/18943 is deployed
        public override IReadOnlyList<MigrationOperation> GetDifferences(IModel source, IModel target)
        {
            return base.GetDifferences(source, target)
                    .Where(o => !(o is UpdateDataOperation))
                    .ToList();
        }
    }

    services.AddDbContextPool<Context>(o =>
    {
        o.ReplaceService<IMigrationsModelDiffer, ModelDiffer>();
        o.UseSqlServer(connectionString, ...
    }