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copied!<p>I managed to get it working by doing the following:</p> <pre><code>public class Case { public virtual int? Id { get; set; } public virtual CaseReferral Referral { get; set; } } public class CaseReferral { public virtual string Type { get; protected set; } public virtual int? ReferralId { get; protected set; } public virtual string Name { get { return null; } //NOTE: We need this for mapping reasons protected virtual int CaseId { get; set; } protected CaseReferral() { } } public class CaseSourceAReferral : CaseReferral { private SourceA _sourceA; public virtual SourceA Source { get { return _sourceA; } protected set { _sourceA = value; Type = "SourceA"; ReferralId = ( _sourceA != null ? _sourceA.Id : null ); } } public override string Name { get { return Source.Name; } } //NOTE: Default constructor for mapping reasons protected CaseSourceAReferral() { } public CaseSourceAReferral( int caseId, SourceA source ) { CaseId = caseId; Source = source; } } public class CaseMap : ClassMap<Case> { public CaseMap() { Id( c => c.Id ); References( c => c.Referral ).Column( "Id" ); } } public class CaseReferralMap : ClassMap<CaseReferral> { public CaseReferralMap() { Id( Reveal.Property<CaseReferral>( "CaseId") ).Column( "Id" ); Map( r => r.Type ).Column( "ReferralType" ); Map( r => r.ReferralId ).Column( "ReferralId" ); DiscriminateSubClassesOnColumn( "ReferralType" ); } } public class CaseSourceAReferralMap : SubclassMap<CaseSourceAReferral> { public CaseSourceAReferralMap() { DiscriminatorValue( "SourceA" ); References( r => r.Source ).Column( "ReferralId" ); } } </code></pre>

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