Two levels of composition doesn't work

Describe the bug Two levels of composition doesn’t work with EF Core

To Reproduce Invoice -> Invoice Line Item -> Invoice Item details

class Invoice
{
    [Composition] 
    List<InvoiceLineItem> InvoiceLineItems { get; set; }
}

class InvoiceLineItem
{
    [Composition]

    List<InvoiceItemDetails> InvoiceItemDetails { get; set; }
}

class InvoiceItemDetails
{
   
}

Expected behavior MapAsync to track down to second level, it only tracks first with EF Core and all InvoiceItemDetails are tracked as Added.

[traiannemes]

It works like a charm! Thank you Leonardo, really great job! I love it!

[traiannemes]

Your unit test is tracking the entities and that’s why it’s working. At line 50 in the unit test please add “db.ChangeTracker.Clear();” (before mapping the 2nd time) And please add at line 69: await db.SaveChangesAsync(); (you forgot to save the 2nd time)

And then the test will fail with a constraint db error

Now it will work if we eagerly go ahead before await db.MapAsync<>() call and load all the entities from the DB that are in the graph.

If we don’t do that than the composition works a single level down.