Unreal Engine Asset Manager and Widget Blueprints in Packaged Builds

AssetManager.cpp

FAssetRegistryModule& AssetRegistryModule = FModuleManager::LoadModuleChecked<FAssetRegistryModule>(FName("AssetRegistry"));
IAssetRegistry& AssetRegistry = AssetRegistryModule.Get();

TArray<FString> ContentPaths;
ContentPaths.Add("/Game");
AssetRegistry.ScanPathsSynchronous(ContentPaths, true);

// Use the asset registry to get the set of all class names deriving from Base
TSet< FName > DerivedNames;
{
	TArray< FName > BaseNames;
	BaseNames.Add(UUSERWIDGETBASECLASS::StaticClass()->GetFName());
	TSet< FName > Excluded;
	AssetRegistry.GetDerivedClassNames(BaseNames, Excluded, DerivedNames);
}
	
FARFilter Filter;
Filter.ClassNames.Add(FName("WidgetBlueprint"));
Filter.bRecursivePaths = true;
Filter.bRecursiveClasses = true;

TArray<FAssetData> AssetList;
AssetRegistry.GetAssets(Filter, AssetList);
	
for( FAssetData Asset : AssetList )
{
  // Get the the class this blueprint generates (this is stored as a full path)
	FAssetTagValueRef GeneratedClassPathPtr = Asset.TagsAndValues.FindTag(TEXT("GeneratedClass"));
	
	if(GeneratedClassPathPtr.IsSet())
	{
		// Convert path to just the name part
		const FString ClassObjectPath = FPackageName::ExportTextPathToObjectPath(GeneratedClassPathPtr.AsString());
		const FString ClassName = FPackageName::ObjectPathToObjectName(ClassObjectPath);

		// Check if this class is in the derived set
		if(!DerivedNames.Contains(*ClassName))
		{
			continue;
		}

		//Register this PrimaryAsset Widget Blueprint with its PrimaryAssetId and FAssetData
		AssetManager.RegisterSpecificPrimaryAsset(Asset.GetPrimaryAssetId(), Asset);
	}
}