API Reference > presentation-common > PresentationRules > DEPRECATED_RelatedPropertiesSpecification > handleTargetClassPolymorphically handleTargetClassPolymorphically handleTargetClassPolymorphically: undefined | boolean Should the target class specified in DEPRECATED_RelatedPropertiesSpecification.relatedClasses be handled polymorphically. This means properties of not only the target class, but also all its subclasses are loaded. note There's a difference between loading properties and instances polymorphically. This attribute only controls polymorphism of properties, while instances are always looked up in a polymorphic fashion. Defined in presentation/common/src/presentation-common/rules/content/modifiers/RelatedPropertiesSpecification.ts Line 95 Last Updated: 29 November, 2022