Saving objects containing Complex Types does not work

[hal-la]

Issue:

Complex Types are not saved with a FileBaseContext db. The issue happens when the Complex Type is mapped as a reference type or a value type (when explicitly mapped as a Complex Type).

The workaround that I accidentally stumbled upon while playing around with the Color class is to change the actual data type of the Complex type from a class to a struct, then removing the ComplexProperty mapping,

Model Setup:

   // This is the Complex Type
    public class ProfilePicture
    {
        public string Url { get; set; }
        public uint Height { get; set; }
        public uint Width { get; set; }
    }

    public class Player
    {
        public uint Id { get; private set; }
        public uint Level { get; set; }
        public ProfilePicture ProfilePicture { get; set; }
    }

DbContext Setup:

public class FileDbContext : DbContext
{
    public DbSet<Person> Persons { get; set; }
    private readonly string? _dbPath;

    public FileDbContext()
    {
        _dbPath = "local_db";
    }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder
            .UseFileBaseContextDatabase(
                _dbPath,
                applyServices: services =>
                {
                    services.ConfigureJsonSerializerOptions(options =>
                    {
                        options.WriteIndented = true;
                    });
                }
            )
            .EnableSensitiveDataLogging();

        base.OnConfiguring(optionsBuilder);
    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Player>(e =>
        {
            e.ComplexProperty(pl => pl.ProfilePicture);
        });
    }
}

Test:

using (var db = new FileDbContext())
{
    Player player =
        new()
        {
            Level = 1,
            ProfilePicture = new ProfilePicture()
            {
                Url = "localhost/img.png",
                Height = 100,
                Width = 100
            }
        };
    db.Players.Add(player);
    db.SaveChanges();
}

Expected Result:

  {
    "Id": 1,
    "Level": 1,
    "ProfilePicture": {
      "Url": "localhost/img.png",
      "Height": 100,
      "Width": 100
    }
  }

Actual Result:

[
  {
    "Id": 1,
    "Level": 1
  }
]