Question

I am trying to get a List<User> which in turn contains a List<Article> for every User, however when querying i get the List<User> and every User (the only User) has a List<Article> but it doesn’t contain anything.

I’ve checked my DB and the keys match, so my guess (well ,not much of a guess) is that there is some issue in my mapping. I’ve searched for examples for one-to-many (HasMany) and tried them but nothing’s working. Anyone who have any idea what might be wrong?

Classes

    public class User
    {
        public virtual int UserId { get; set; }
        public virtual string Name { get; set; }
        public virtual string Password { get; set; }
        public virtual IList<Article> Articles { get; set; }

        public User()
        {
            Articles = new List<Article>();
        }
    }

public class Article
{
    public virtual int ArticleId { get; set; }
    public virtual string Title { get; set; }
    public virtual string Ingress { get; set; }
    public virtual DateTime Created { get; set; }
    public virtual string ArticleText { get; set; }
    public virtual User Author { get; set; }
}

These are my mappings

    public class UserMap : ClassMap<User>
    {
        public UserMap()
        {
            Id(x => x.UserId);
            Map(x => x.Name);
            Map(x => x.Password);
            HasMany(x => x.Articles).KeyColumn("UserId").LazyLoad();
        }
    }


    public class ArticleMap : ClassMap<Article>
    {
        public ArticleMap()
        {
            Id(x => x.ArticleId);
            Map(x => x.Title);
            Map(x => x.Ingress);
            Map(x => x.Created);
            References(x => x.Author).Column("UserId").LazyLoad();
            Map(x => x.ArticleText).Length(4001);
        }
    }

And here is my call to insert / select

        List<User> usr = new List<User>();
        using (var session = SessionFactoryHelper.OpenSession())
        {
            using (var transaction = session.BeginTransaction())
            {



               User u = new User
               {
                   Name = "Mohindra",
                   Password = "Corn"
               };

               Article a = new Article
               {
                   Title = "Doh!",
                   Ingress = "yada yada",
                   ArticleText = "why dammit! whyyy?!11!!",
                   Created = DateTime.Now,
                   Author = u
               };

               session.Save(u);
               session.Save(a);


               usr = session.Query<User>().ToList();
               transaction.Begin();

               transaction.Commit();
            }
        }

This might be the simplest of rookie mistakes but I am very new to using O/RM’s so i don’t know what might be the issue here.

Answer 1

Used,
HasMany(x => x.Articles).Table("Article").KeyColumn("UserId").LazyLoad();
And then I saved my objects independently.

When I should have used,
HasMany(x => x.Articles).Table("Article").KeyColumn("UserId").Cascade.All();

^ In this case the Article inherited my User and I could then save them with the relation.