public function store(AddItemToCartRequest $request, Product $product, StockValidator $stockValidator)
{
$attributes = $request->input('attributes', []);
// If product has variant but the selected attributes don't match one
// use the first variant by default.
$variant = $product->variants()->hasAttributeOptions($attributes)->first();
if ($product->hasVariants() and !$variant) {
$variant = $product->variants()->first();
}
$stockValidator->validate($product, $variant, $request->input('quantity'));
$this->cartManager->addItemToCart($this->user(), $product, $variant, $request->all());
Session::flash('added_to_cart', 1);
return $this->success('add');
}