NHibernate Mapping Question - nhibernate

Question

I have tried various approaches to mapping the following structure, but I finally admit that after a day of not getting very far, I need some help.
So the question is, how would you guys go about mapping something like this. The schema is not fixed at this point.
public abstract class BaseObject
{
public virtual int Id { get; set; }
public virtual string Name { get; set; }
public virtual string Description { get; set; }
public virtual string Prefix { get; set; }
public virtual string Suffix { get; set; }
public virtual BaseObject Parent { get; set; }
}
public class Room : BaseObject
{
public virtual int AreaId { get; set; }
}
public class Item : BaseObject
{
public virtual string Owner { get; set; }
public virtual IList<ItemAttribute> Attributes { get; set; }
public virtual int ItemTypeId { get; set; }
}
public class Potion : Item
{
public virtual int AmountLeft { get; set; }
}
Your input is very much appreciated.

Answer 1

This allows you to have it all in one table... doing this from memory, so syntax might not be exact.
public class ItemMap : ClassMap<BaseObject>
{
...
WithTable("objects");
Id(x => x.Id).GeneratedBy.Identity();
Map(x => x.Name);
Map(x => x.Description);
...
DiscriminateSubClassesOnColumn("Type")
.SubClass<Room>("Room", x =>
{
x.Map(r => r.AreaId);
})
.SubClass<Item>("Item", c =>
{
i.Map(x => x.Owner);
i.References(x => x.Account).LazyLoad();
HasManyToMany(x => x.Attributes)
.WithParentKeyColumn("ItemId")
.WithChildKeyColumn("AttributeId")
.WithTableName("ItemAttributes")
.LazyLoad();
});
.SubClass<Potion>("Potion", x =>
{
x.Map(p => p.AmountLeft);
})

Answer 2

I would probably have a table for each class - Room, Item, Potion and then do fairly standard mappings for each.
I'd like to note that in my own experiences, it is a bad idea to name your Id field in your business objects "Id"
Here's a sample with Item, assoming some data names for your table.
public class ItemMap : ClassMap<Item>
{
public ItemMap()
{
WithTable("Items");
Id(x => x.Id, "ItemId").GeneratedBy.Identity();
Map(x => x.Name);
Map(x => x.Description);
Map(x => x.Prefix);
Map(x => x.Suffix);
Map(x => x.Owner);
Map(x => x.ItemTypeId);
References<Item>(x => x.Parent, "ParentItemId");
HasManyToMany(x => x.Attributes)
.WithParentKeyColumn("ItemId")
.WithChildKeyColumn("AttributeId")
.WithTableName("ItemAttributes")
.LazyLoad();
}
}
This is more than likely not be perfect - as I'm not sure how the mapping will work with the abstract parent.