/**
  * Create a variant for each product that does not have any.
  */
 public function initialiseProductOptions()
 {
     /** @var Product $product */
     foreach (Product::has('options', '<', 1)->get() as $product) {
         echo "Creating option for product {$product->id}\n";
         $product->options()->save(new ProductOption(['label' => 'Standard']));
     }
 }