Manually setting the ID

Question

I have a Users table where the "ID" field is a GUID field.

Using ASPNET I am creating a user account and getting the GUID back. I am trying to create associated records in my tables with that GUID as the main ID.

The problem I am running into is that when I manually set Users.ID NHibernate tries to do an Update, not an Insert. I see this with the NHibernate Profiler before it bombs out with "Unexpected row count: 0; Expected: 1".

My UsersMap for the table Users looks like:

public class UsersMap : ClassMap<Users>
{
    public UsersMap()
    {
        Id(x => x.ID, "ID"); //GUID

        Map(x => x.Name, "Name"); //string
        Map(x => x.PhoneNumber, "PhoneNumber"); //string
        Map(x => x.FaxNumber, "FaxNumber"); //string
        Map(x => x.EmailAddress, "EmailAddress"); //string

        HasMany<UsersAddressBook>(x => x.usersAddressBook).KeyColumn("ID");
    }
}

Any ideas? Thanks in advance.

Answer 1

ISession.Save has an overload that allows you to specify identifier. Try using it, and don't set your id property manually.

Answer 2

You need to specify that your id will be assigned.

Id(x => x.ID)
  .GeneratedBy.Assigned();

This will allow you to specify the value, without NHibernate trying to perform an update.