OneToOne mapping by code nhibernate 3.2 - nhibernate

Question

I'm trying to upgrade a project and use the build in code mapper.
I have 2 entities:
public class Person {
public virtual int Id { get; set; }
public virtual User User { get; set; }
}
public class User {
public virtual int Id { get; set; }
public virtual User Person { get; set; }
}
The database structure is like this:
table: users, fields: id
table: people, fields: id, userId
With FluentNHibernate i could map it like this:
public class UserMap : ClassMap<User> {
public UserMap() {
Id(x => x.Id).GeneratedBy.Identity();
HasOne(x => x.Person).PropertyRef("User").Not.LazyLoad();
}
}
public class PersonMap : ClassMap<Person> {
public PersonMap() {
Id(x => x.Id).GeneratedBy.Identity();
References(x => x.User).Column("UserId").Not.Nullable().Not.LazyLoad();
}
}
But is can't get it working with NH 3.2 build in code mapper.
This is what i have done so far.
OneToOne(x=>x.Person, m => {
m.PropertyReference(typeof(Person).GetProperty("User"));
});
OneToOne(x=>x.User, m => {});
Now the relation is mapped on User.Id and Person.Id but personid and userid can be different.
It's also possible that a user has no person.
from Users user0_ left outer join People person1_ on user0_.Id=person1_.Id
I think i have to specify that Person -> User is mapped with the UserId column but how?.

Answer 1

Since you were using References() in Fluent, you need to convert that to ManyToOne():
public class UserMap : ClassMapping<User>
{
public UserMap()
{
Id(x => x.Id, x => x.Generator(Generators.Identity));
OneToOne(x => x.Person,
x => x.PropertyReference(typeof(Person).GetProperty("User")));
}
}
public class PersonMap : ClassMapping<Person>
{
public PersonMap()
{
Id(x => x.Id, x => x.Generator(Generators.Identity));
ManyToOne(x => x.User,
x => x => { x.Column("UserId"); x.NotNullable(true); });
}
}
Two notes:
The type of User.Person should be Person, not user (that's probably just a bad edit)
.Not.LazyLoad() is almost always a bad idea. See NHibernate is lazy, just live with it