c# - Fluent NHibernate: How to have a one-to-many reference in both directions? -

we have users on our system , persons. there many persons each user. when user logs on, need primary person record fill in name, address, phone, etc.

public class person {     /// <summary>every person belongs user.</summary>     public virtual user user { get; set; }     public virtual string firstname { get; set; }     public virtual string lastname { get; set; }     public virtual string address { get; set; }     public virtual string phone { get; set; }     // more methods & properties }  public class user : entity {     public virtual string username { get; set; }     public virtual string password { get; set; }     /// <summary>every user has primary person record.</summary>     public virtual person primaryperson { get; set; }     // more methods & properties } 

how class map without circular reference?

try this:

public class personmap : classmap<person> {   public personmap()   {     table("persons");     id(x =>x.id, "personid").generatedby.identity();     references(x => x.user).column("userid").cascade.all();     map(x => x.firstname, "firstname");     map(x => x.lastname, "lastname");     map(x => x.address, "address");     map(x => x.phone, "phone");     // more property maps   } }  public class usermap : classmap<user> {   public usermap()   {     id(x => x.id, "userid").generatedby.identity();     map(x => x.username, "username");     map(x => x.password, "password");     references<person>(x => x.primaryperson).foreignkey("primarypersonid").cascade.all();   } } 

this assuming ids autonumber , when update user, want primaryperson updated along it. change cascade.all() cascade.none() if isn't case. sure when do, update primaryperson manually or you'll "object references unsaved transient instance" upon submitchanges() if don't.