Castle ActiveRecord: one-to-one - nhibernate

Question

While playing around with one-to-one associations in castle activerecord I stumbled upon the following problem:
I'm trying to model a one-to-one relationship (user-userprofile in this case). I already learned that this may not be a best practice, but let's ignore that for a moment (I'm still trying to understand what's going on).
[ActiveRecord]
public class TestUser : ActiveRecordBase<TestUser>
{
[PrimaryKey(PrimaryKeyType.GuidComb)]
public Guid Id { get; set; }
}
[ActiveRecord]
public class TestUserProfile : ActiveRecordBase<TestUserProfile>
{
[PrimaryKey(PrimaryKeyType.GuidComb)]
public Guid Id { get; set; }
[OneToOne(Cascade = CascadeEnum.All, Fetch = FetchEnum.Join)]
public TestUser User { get; set; }
}
I would expect the following code to save a user with profile, yielding the same Id in the database:
[Test]
public void save_profile_saves_user()
{
var profile = new TestUserProfile
{
User = new TestUser()
};
profile.Save();
}
The actual result however is that both objects are saved with a different key. Am I missing something??

Answer 1

I've found the answer myself. The PrimaryKeyType of the side of the relation where OneToOne is defined should have a PrimaryKey of PrimaryKeyType.Foreign:
[ActiveRecord]
public class TestUserProfile : ActiveRecordBase<TestUserProfile>
{
[PrimaryKey(PrimaryKeyType.Foreign)]
public Guid Id { get; set; }
[OneToOne(Cascade = CascadeEnum.All, Fetch = FetchEnum.Join)]
public TestUser User { get; set; }
}
Back to reading the docs more thoroughly...