public function changeStock($productId, $newQuantity)
{
$this->validatePermissions();
$categoryModel = new ProductModel();
$viewModel = new InformationViewModel();
try {
$categoryModel->changeStock($productId, $newQuantity);
$viewModel->success = "Quantity of product {$productId} updated successfully";
} catch (\Exception $e) {
$viewModel->error = $e->getMessage();
}
return new View($viewModel);
}
