Stevebauman\Inventory\Traits\CommonMethodsTrait::isValidQuantity PHP Метод

    public function isValidQuantity($quantity)
    {
        if ($this->isPositive($quantity)) {
            return true;
        }
        $message = Lang::get('inventory::exceptions.InvalidQuantityException', ['quantity' => $quantity]);
        throw new InvalidQuantityException($message);
    }