Question

In the most simplified version , here is my problem

public class D{
 public List<A> ListofA {get;set;}
}

public interface A{
}

public class B implements A{
}

public class C implements A{
}

class B maps to Table B
class C maps to Table C

A is just an interface and is not mapped to any table.

How do I define the polymorphic (many-to-many) association between D -> A

I am using NHibernate with FluentMapping.

Answer 1

I am attemped to answer my own question.
However I would like to find out BETTER/ MORE RATIONAL solution to this problem.

Here is my solution:

Redesign Class D

I redesign class D as

      public class D {
              public List<MagicObj> ListofA {get;set;}
      }

       //New Entity added which was not there in the question before.
       public class MagicObj{
              public A   ActualEntity{get;set;}
       }

NO changes in the remaining entities.

         public interface A{

         }

         public class B implements A{

         }

         public class C implements A{

         }

This design change should allow me to map

Fluent Mapping

for the above redesigned class structure

D->MagicObj as HasMany(x=>x.ListofA)
MagicObj->A as ReferenceAny(x=>x.ActualEntity)
                    .EntityIdentifierColumn("EntityType")
                    .EntityIdentifierColumn("EntityId");

Guess I choose to use add a new relation between Class D and Class A is that
I was not able to find a way to map it directly in Fluent.