Hi there,

there seems to be a problem with recursive data structures and (Fluent-)NHibernate or its just me, being a complete moron...

here's the tree:

public class SimpleNode {

    public SimpleNode ()
    {
        this.Children = new List<SimpleNode> ();
    }

    public virtual SimpleNode Parent { get; private set; }
    public virtual List<SimpleNode> Children { get; private set; }

    public virtual void setParent (SimpleNode parent)
    {
        parent.AddChild (this);
        Parent = parent;
    }

    public virtual void AddChild (SimpleNode child)
    {
        this.Children.Add (child);
    }

    public virtual void AddChildren (IEnumerable<SimpleNode> children)
    {
        foreach (var child in children) {
            AddChild (child);
        }
    }

}

the mapping:

public class SimpleNodeEntity : ClassMap<SimpleNode>

{
    public SimpleNodeEntity ()
    {
        Id (x => x.Id);

        References (x => x.Parent).Nullable ();

        HasMany (x => x.Children).Not.LazyLoad ().Inverse ().Cascade.All ().KeyNullable ();
    }
}

now, whenever I try to save a node, I get this:

System.InvalidCastException: Cannot cast from source type to destination type. at (wrapper dynamic-method) SimpleNode. (object,object[],NHibernate.Bytecode.Lightweight.SetterCallback) at NHibernate.Bytecode.Lightweight.AccessOptimizer.SetPropertyValues (object,object[]) at NHibernate.Tuple.Entity.PocoEntityTuplizer.SetPropertyValuesWithOptimizer (object,object[])

My setup:

Mono 2.8.1 (on OSX), NHibernate 2.1.2, FluentNHibernate 1.1.0