Question

I have a “Activity” entity, this entity can have several “Task”.

Here the code for the entities :

public class Activity : Entity<int>
{
    public virtual int Id { get; set; }
    public virtual string Code { get; set; }
    public virtual string Name { get; set; }
    public virtual Iesi.Collections.Generic.ISet<Task> Tasks { get; set; }

    public Activity()
    {
        Tasks = new Iesi.Collections.Generic.HashedSet<Task>(); 
    }
}

public class Task
{
    public virtual int Id { get; set; }
    public virtual string Code { get; set; }
    public virtual string Name { get; set; }
    public virtual Activity Activity { get; set; } 
}

The mapping :

public ActivityMap()
{
    Id(x => x.Id).GeneratedBy.Native();
    Map(x => x.Code);
    Map(x => x.Name);

    HasMany(x => x.Tasks)
        .KeyColumns.Add("Activity")
        .AsSet()
        .Inverse()
        .Cascade.AllDeleteOrphan();
}

public TaskMap()
{
    Id(x => x.Id).GeneratedBy.Native();
    Map(x => x.Code);
    Map(x => x.Name);
}

The test :

activity = new Activity
{
    Code = "...",
    Name = "..."
};

Task task = new Task
{
    Code = "...",
    Name ="...",
    Activity = activity
};
session.Save(activity);

I see whit NHProf 2 insert.
After the commit, I do a GetById of the entity “Activity” but the “Tasks” property is empty. In the database, the field “Activity” (entity “Task”) is null.

Answer 1

activity = new Activity
{
    Code = "...",
    Name = "..."
};

Task task = new Task
{
    Code = "...",
    Name ="...",
    Activity = activity
};
activity.Tasks.Add(task);
session.Save(activity);

You have to keep the relation between two objects in both sides.

P.S. maybe you should change the cascade to be .Cascade.All(); because when I tryed Delete orphan it just didn’t seem to work right.

Update: as @Stefan Steinegger mentioned you didn’t Map the activity.

public TaskMap()
{
    Id(x => x.Id).GeneratedBy.Native();
    Map(x => x.Code);
    Map(x => x.Name);
    References( x => x.Activity); //Missing mapping 
}

But you still need to update the relation in both sides.