流利的Nhibernate:自指多对多

Public class Something
{
    public int Id;
    public IList<Something> Similarthings { get; set; }
}

public class SomtehingMapping
    {
        public SomtehingMapping()
        {
            Map(x => x.Id);
            HasManyToMany(x => x.Similarthings )
               .Table("SomethingsToSimilarthings")
               .ParentKeyColumn("SomethingA_Id")
               .ChildKeyColumn("SomethingB_Id")
               .Cascade.All();
         }
}

你最后得到的是:

Table SomethingsToSimilarthings
-------------------------------
SomethingA_Id    SomethingB_Id
111              222
222              111

是否有任何方法可以定义此映射,以便仅使用一个数据库行来表示双向关系?