Map One-To-One Relationship Doesn't Allow Inserting
- by nfplee
Hi, I'm trying to setup a one-to-one mapping from my Users to the UserDetails table. Say I have the following tables in my database:
Users:
- UserID (PK, Identity)
- UserName
- Password
UsersDetails:
- UserID (PK, FK)
- FirstName
- LastName
I have created the following poco classes:
public class User {
public virtual int UserID { get; set; }
public virtual string UserName { get; set; }
public virtual string Password { get; set; }
public virtual UserDetails Details { get; set; }
}
public class UserDetails {
public virtual int UserID { get; set; }
public virtual User User { get; set; }
public virtual string FirstName { get; set; }
public virtual string LastName { get; set; }
public UserDetails() {
}
public UserDetails(User user) {
User = user;
}
}
Which are fluently mapped (please note the xml mapping is very similar and if all you know is the xml mapping then I would still appreciate you guidance):
public class UserMap : ClassMap<User> {
public UserMap() {
Table("Users");
Id(x => x.UserID);
Map(x => x.UserName);
Map(x => x.Password);
HasOne(x => x.Details)
.Constrained()
.Cascade.All();
}
}
public class UserDetailsMap : ClassMap<UserDetails> {
public UserDetailsMap() {
Table("UsersDetails");
Id(x => x.UserID)
.GeneratedBy.Foreign("User");
HasOne(x => x.User)
.Constrained();
Map(x => x.FirstName);
Map(x => x.LastName);
}
}
Everything displays correctly but if I say:
var user = new User() { UserName = "Test", Password = "Test" };
user.Details = new UserDetails(user) { FirstName = "Test", LastName = "Test" };
session.Save(user);
I get the error:
"NHibernate.Id.IdentifierGenerationException: null id generated for: UserDetails."
I'd really appreciate it if someone could show me what I've done wrong. Thanks
