Proper way of editing properties in jsonb

[skynet2]

Hello,
As far as CLR types are not tracked by ef core (#1117)
What's the proper way of updating inner entities?

models.cs

    public class CouponConfiguration
    {
        public int MaxEvents { get; set; }
    }
    public class Configurations
    {
        public int Id { get; set; }
        public CouponConfiguration Coupon { get; set; }
        public int CreatedBy { get; set; }
        public DateTime CreatedAt { get; set; }
    }

context.cs

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
          modelBuilder.Entity<Configurations>(builder =>
            {
                builder.HasKey(x => x.Id);

                builder.Property(x => x.Coupon).HasColumnType("jsonb");
                builder.Property(x => x.CreatedBy).IsRequired();
                builder.Property(x => x.CreatedAt).IsRequired();
            });
         }

test.cs

[Test]
        public void CanEditConfiguration()
        {
            var provider = Setup.ServiceProvider.CreateScope().ServiceProvider;

            var obj = new Configurations()
            {
                Coupon = new CouponConfiguration()
                {
                    MaxEvents = 1000
                }
            };

            var context = provider.GetService<PartnerContext>();
            
            context.Configurations.Add(obj);

            context.SaveChanges();

            try
            {
                obj.Coupon.MaxEvents = 100;
                context.Entry(obj.Coupon).State = EntityState.Modified;
                context.SaveChanges();
            }
            catch (Exception ex)
            {
                var xx2 = 0;
            }


            var xx = 0;
        }

Saving works without any issues. But once I try to edit data, I`m setting Modified state manually.

context.Entry(obj.Coupon).State = EntityState.Modified;

And that action causes exception: System.InvalidOperationException: The entity type 'CouponConfiguration' was not found. Ensure that the entity type has been added to the model.
It`s possible to bypass that exception when setting the whole entity to state modified, then update works.

context.Entry(obj).State = EntityState.Modified;

But doing that will cause ef core to update ALL properties, instead of only one inner object.

Is it possible to bypass that limitation\exception somehow?

Thanks,
Stas

[roji]

Going over old issues and came across this - sorry I haven't responded earlier.

CouponConfiguration isn't an entity type known by EF Core, since it's mapped to a json column. In other words, EF Core doesn't track the individual properties contained inside CouponConfiguration.

You can manage the change tracking state of individual properties as follows:

ctx.Entry(obj).Property(o => o.Coupon).IsModified = true;

This should make only your jsonb property as changed, and send and UPDATE only for that when you call SaveChanges.