Fluent Nhibernate and HasOne() problems

How do you do a 1 to 1 relationship with fluent nhibernate? I am using ms sql server 2008 and every time I looked the db tables through the database diagram viewer the table that should have one to one relationships don't seem to have them.

Users
UserId <pk> Guid


Settings
UserId <pk> Guid


public Settings
{
  public virtual Guid UserId {get; private set;}
 public virtual Setting User { get; set; }

}

public User
{
  public virtual Guid UserId {get; private set;}
 public virtual Setting Setting { get; set; }
}


public class UserMap : ClassMap<User>
 {
      I开发者_C百科d(x => x.UserId);
     HasOne(x => x.Setting);
}

public class SettingMap : ClassMap<Setting>
 {
      Id(x => x.UserId);
     HasOne(x => x.User);
}

So I tried this but it did not work.

Why do you have a property of type Setting on your Setting class? It's called User so I would expect it (also because of your description of the problem) that it be a User class instead.

I had a similar problem, couldnt see any relationships being generated. I finally found that this worked:

 public class ParentMap : ClassMap<Parent>
{
   public ParentMap()
  {
      Id(x => x.Id);
     HasOne(s => s.Child).Cascade.All();
  }
}

public class ChildMap : ClassMap<Model.Child>
{
   public ChildMap()
  {
    Id(x => x.Id);
    HasOne(s => s.Parent).Constrained().ForeignKey();           
   }
}