I have a class hierachy mapped which works fine when retrieved with a NH session using Fluent.

However where another mapped class has a reference to the base class only a proxy for the base class is created not the correct subclass which is defined by the discriminator value for the object with the specified Id. I guess the problem is that the references method does not know it needs to create the sub class.

Is there anyway to always create an object as it's actual type based on the discriminator value.

You need to post mappings or more details.

If I have two classes:

SubClass1
SubClass2

that are both derived from:

Base1

and I create a third class Class3 that references the two subclasses as

Base1 SubClass1
{
get, set
}

and

Base1 SubClass2
{
get, set
}

then my class3 correctly returns the SubClass1 or SubClass2 as set in the properties. Well specifically what it returns is an instance of Base1 since that is how the property is defined, but that instance can then be cast to the proper subclass.

Is this what you are trying to do? If so it should work - there may be a problem with your mappings

Class1 : Member
{
}

Class2 : Member

Here is the class

public class Link : ValueObject<Link>
{
protected virtual int Id { get; set; }

public virtual Member LinkFrom{get;protected set;}
public virtual Member LinkTo{get;protected set;}


Here is my map

public class LinkMap : ClassMap<Link>
{
public LinkMap()
{
Id(Reveal.Member<Link>("Id"), "LinkId")
.GeneratedBy.Native();

References(x => x.LinkFrom, "LinkFrom");
References(x => x.LinkTo, "LinkTo");
References(x => x.Definition).Columns("linkType", "reverselinkType").Fetch.Join();

Map(x=>x.LinkDate);
Table("Links");
}
}

Here is the hbm produced by fluent

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" default-access="property" auto-import="true" default-cascade="none" default-lazy="true">
<class xmlns="urn:nhibernate-mapping-2.2" mutable="true" name="DTE.Business.Domain.MembershipCourses.Link, DTE.Business, Version=0.0.2.0, Culture=neutral, PublicKeyToken=null" table="Links">
<id name="Id" type="System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<column name="LinkId" />
<generator class="native" />
</id>
<property name="LinkDate" type="System.DateTime, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<column name="LinkDate" />
</property>
<many-to-one class="DTE.Business.Domain.MembershipCourses.Member, DTE.Business, Version=0.0.2.0, Culture=neutral, PublicKeyToken=null" name="LinkFrom">
<column name="LinkFrom" />
</many-to-one>
<many-to-one class="DTE.Business.Domain.MembershipCourses.Member, DTE.Business, Version=0.0.2.0, Culture=neutral, PublicKeyToken=null" name="LinkTo">
<column name="LinkTo" />
</many-to-one>
<many-to-one class="DTE.Business.Domain.MembershipCourses.LinkType, DTE.Business, Version=0.0.2.0, Culture=neutral, PublicKeyToken=null" fetch="join" name="Definition">
<column name="linkType" />
<column name="reverselinkType" />
</many-to-one>
</class>
</hibernate-mapping>

Thanks for the reply.