It's quite some time that I'm trying to figure out this problem and from googling around many people have similar problems.
I'm trying to model a User in a Social Network, and what is more basic to a social network than to map a friendship relation?
Every user in the system should have a list of it's friends and I thought that this might be an incredibly easy task (just use a ManyToMany relation, right?). So I went on to try the following:
Code:
@Entity
@Table(name="users")
public class User {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@Column(name="userid")
protected Long id = null;
@ManyToMany
protected List<User> friends = null
}
The problem now is that it tells me I use ManyToMany wrongly by having no clear distinction between friend and befriended. So far so good, I get the error, but how can I do what I want?
Any idea? I've reached the end of my wisdom.
Login
FAQ
Search