Mapping class hierarchy through fluent nhibernate by using 2 strategies - nhibernate

Question

I want to combine table-per-class and table-per-hierarchy strategies using fluent nhibernate or nhibernate itself(I mean hbm files), but I don't know how. I prefer fluent over hbm but if it's impossible, then hbm is also fine. I tested this by introducing Entity as ClassMap and all other as SubClassMap in fluent but then in hbm files generated by fluent, Entity was a class and all other were joined-classes which is not what I want. I will describe the problem in more detail below.
Class hierarchy:
public class Entity
{
public int ID { get; set; }
public string Name { get; set; }
}
public abstract class Person : Entity
{
public string Phone { get; set; }
}
public class SystemUser : Person
{
public string Password { get; set; }
}
I want to have one table for entity and one for person and all kinds of it(all its subclasses).I mean I want to use table-per-class strategy for Entity and table-per-hierarchy strategy for Person and SystemUser classes. Database structure is something like this:
EntityTable(ID(PK),Name)
PersonTable(EntityID(PK,FK),Phone,Password)
any help appreciated.

Answer 1

if EntityTable Id is not database generated (which is discouraged by NH anyways) you can use the trick
public PersonMap : ClassMap<Person>
{
public PersonMap()
{
Table("PersonTable");
Id(p => p.Id, "EntityID").GeneratedBy.HiLo("100");
DiscriminateSubClassesOnColumn("PersonType");
Map(x => x.Phone);
Join("EntityTable", join =>
{
join.KeyColumn("ID");
join.Map(p => p.Name);
});
}
}
public SystemUserMap : SubclassMap<SystemUser>
{
public SystemUserMap()
{
Map(x => x.Password);
}
}