Undo / Redo Transaction Fails

Development Programming & Scripting C++
1

Not sure what I’m doing wrong here. I’m creating a custom module-based editor for a class, and I’m trying to add undo and redo support for adding and removing modules.

Here’s an example of what I’m doing:



	// Create an Undoable Transaction
	{
		FScopedTransaction Trans = FScopedTransaction(LOCTEXT("CreateOrdModule_Transaction", "Create Module"));
		CurrentTemplate->Modify();

		// Notify Template
		CurrentTemplate->PreEditChange(nullptr);

		// Construct Module and add to selected emitter
		UST_OrdnanceModule* NewModule = NewObject<UST_OrdnanceModule>(CurrentTemplate, NewModuleClass, NAME_None, RF_Transactional);
		NewModule->Modify();
		NewModule->SetToSensibleDefaults();
		NewModule->SetTransactionFlag();

		CurrentTemplate->OrdnanceModules.Add(NewModule);

		CurrentTemplate->OnModulesUpdated();
		CurrentTemplate->PostEditChange();

		ForceRefresh();
	}

But if I call Undo after running this transaction, the module is NOT removed from the array. The Array is a UPROPERTY with no extra meta data.

What am I doing wrong here?

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