Setting interface pointer refence to a duplicated UObject pointer

Development Programming & Scripting
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1

Hopefully someone can help!

I’m trying to figure out why setting interface pointer in reference to a duplicated object does not work. During method execution the value is set but once the method is completed, the value is NULL.

Basic idea behind the function is to take a “storable item” interface reference (an generic representation of storable object) which has physical/mesh blueprint implementation, make a duplicate virtual instance (UObject), remove the original item and append the UObject to a property of one of the storage slots.

I am able to make a virtual duplicate and destroy the original physical actor. Also i’m able to set the duplicated UObject as property VirtualStoredItemRefrence in ItemContainer while in the loop (see snippet 1) but once the method StoreItem finishes, when iterating over all ItemContainers the VirtualStoredItemReference is a null object.

Snipped 1:

				// Create virtual replica of original object
				auto Replica = DuplicateObject(Item.GetObject(),Item.GetObject()->GetOuter());
				IStorableItem* ReplicaInterface = Cast<IStorableItem>(Replica);
				ItemContainer->VirtualStoredItemReference = ReplicaInterface;

Code:

EStorageStatus AStorageArea::StoreItem(TScriptInterface<IStorableItem> Item)
{
	auto SlotContainers = GetStorageSlotContainers();
	if(SlotContainers.Num() == 0) return EStorageStatus::FAILED_NO_SLOT_CONTAINERS_AVAILABLE;

	// Process all present containers (must be manually placed in blueprint)
	for(AStorageSlotContainer* Container : SlotContainers)
	{
		// Process only available storage slots
		auto StorageSlots = Container->GetAvailableStorageSlots();
		for(AStorageSlot* Slot : StorageSlots)
		{
			// Item to be stored has "storage container" that "can be stored in slot"
			if(Slot->SupportedStorageItemContainer == Item->GetStorageItemContainerClass())
			{
				// Spawn object container (BP implementation)
				AStorageItemContainer* ItemContainer = GetWorld()->SpawnActor<AStorageItemContainer>(
					Item->GetStorageItemContainerClass().Get(),
					Slot->GetActorLocation(),
					Slot->GetActorRotation()
				);
				
				// Spawn child actor component
				UChildActorComponent* ChildActorComponent = NewObject<UChildActorComponent>(Slot);
				ChildActorComponent->SetChildActorClass(AStorageItemContainer::StaticClass());
				
				// Attach to component
				FAttachmentTransformRules AttachRules(EAttachmentRule::KeepRelative, EAttachmentRule::KeepRelative, EAttachmentRule::KeepRelative, true);
				ItemContainer->AttachToComponent(ChildActorComponent, AttachRules);

				// Register component
				ChildActorComponent->RegisterComponent();

				// Create virtual replica of original object
				auto Replica = DuplicateObject(Item.GetObject(),Item.GetObject()->GetOuter());
				IStorableItem* ReplicaInterface = Cast<IStorableItem>(Replica);
				ItemContainer->VirtualStoredItemReference = ReplicaInterface;
				
				// Destroy original actor
				GetWorld()->DestroyActor(Cast<AActor>(Item.GetInterface()));
				return EStorageStatus::SUCCESS;
			}
		}
		this->Debug_FindFiledVirtualStoredItemReferences();	
	}
	
	return EStorageStatus::FAIELD_NO_SLOTS_AVAILABLE;
}