public function updateFromBuyable(Buyable $item)
    {
        $this->id       = $item->getBuyableIdentifier($this->options);
        $this->name     = $item->getBuyableDescription($this->options);
        $this->price    = $item->getBuyablePrice($this->options);
        $this->priceTax = $this->price + $this->tax;
    }