I'm trying to use S#arp architecture... which includes Fluent NHibernate I'm newbie with (and with NHibernate too, frankly speaking). Auto mapping is used. So I have this:

public class UserAction : Entity
{
    public UserAction() { }

    [DomainSignature]
    [NotNull, NotEmpty]
    public virtual string Name { get; set; }

   [NotNull, NotEmpty]
   public virtual string TypeName { get; private set; }
}

   public class UserActionMap : IAutoMappingOverride<UserAction>
   {
      public void Override(AutoMap<UserAction> mapping)
      {
         mapping.WithTable("ProgramComponents", m => m.Map(x => x.TypeName));
      }
   }

Now, table UserActions references table ProgramComponents (many to one) and I want property UserAction.TypeName to have value from db field ProgramComponents.TypeName.

However, the above code fails with

NHibernate.MappingException: Duplicate property mapping of TypeName found in OrderEntry3.Core.UserAction

As far as I understand the problem is that TypeName is already auto-mapped... but I haven't found a way to remove the automatic mapping. Actually I think that my WithTable/Map mapping has to replace the automatic TypeName mapping, but seems like it does not.

I also tried different mapping (names are different but that's all the same):

   mapping.WithTable("ProgramComponents", m => 
       m.References<ProgramComponent>( x => x.Selector, "ProductSelectorID" )

and still get the same error.

I can overcome this with

mapping.HasOne<ProgramComponent>(x => x.Selector);

but that's not what I exactly wants to do. And I still wonder why the first two methods do not work. I suspect this is because of WithTable.