Hi everyone. My problem is fluent nhibernate mapping a many to many relationship, they end up referencing a non existent Id.

public UserMap()
    {
        Id(x => x.Id);
        Map(x => x.Name);
        Map(x => x.Password);
        Map(x => x.Confirmed);
        HasMany(x => x.Nodes).Cascade.SaveUpdate();
        HasManyToMany<Node>(x => x.Events).Cascade.SaveUpdate().Table("RSVPs");
    }

public EventMap()
    {

        Map(x => x.Starts);
        Map(x => x.Ends);
        HasManyToMany<User>(x => x.Rsvps).Cascade.SaveUpdate().Table("RSVPs");
    }

public NodeMap() {
        Id(x => x.Id);

        Map(x => x.Title);
        Map(x => x.Body).CustomSqlType("text");
        Map(x => x.CreationDate);
        References(x => x.Author).Cascade.SaveUpdate();
        Map(x => x.Permalink).Unique().Not.Nullable();

    }

Those are my classes -notice that Event inherits from Node:

public class Event : Node//, IEvent
{
    private DateTime _starts = DateTime.MinValue;
    private DateTime _ends = DateTime.MaxValue;
    public virtual IList<User> Rsvps { get; set; }

}

The problem is, the generated RSVPs table is like that:

Event_id User_id Node_id

Of course the Event table has no ID - only a Node_id.

When trying to save a relationship it will try to save a NULL event_id thus generating an error.