//let EF take care of its rule that you can't insert a samurai without
//SOME instance of SecretIdentity added (ownedEntities cannot be null)
public override int SaveChanges()
{
foreach (var entry in ChangeTracker.Entries()
.Where(e => e.Entity is Samurai && e.State == EntityState.Added))
{
if (entry.Entity is Samurai samurai)
{
if (entry.Reference("SecretIdentity").CurrentValue == null)
{
entry.Reference("SecretIdentity").CurrentValue = PersonName.Empty();
}
}
}
return(base.SaveChanges());
}
