missingAssociation example

    public function restoreByOrder(string $orderId, Context $context, array $overrideOptions = []): SalesChannelContext
    {
        $order = $this->getOrderById($orderId, $context);
        if ($order === null) {
            throw OrderException::orderNotFound($orderId);
        }

        if ($order->getOrderCustomer() === null) {
            throw OrderException::missingAssociation('orderCustomer');
        }

        $customer = $order->getOrderCustomer()->getCustomer();
        $customerGroupId = null;
        if ($customer) {
            $customerGroupId = $customer->getGroupId();
        }

        $billingAddress = $order->getBillingAddress();
        $countryStateId = null;
        if ($billingAddress) {
            

$this->eventDispatcher->dispatch($event);

        return $event->getConvertedCart();
    }

    /** * @throws CartException */
    public function convertToCart(OrderEntity $order, Context $context): Cart
    {
        if ($order->getLineItems() === null) {
            throw OrderException::missingAssociation('lineItems');
        }

        if ($order->getDeliveries() === null) {
            throw OrderException::missingAssociation('deliveries');
        }

        $cart = new Cart(Uuid::randomHex());
        $cart->setPrice($order->getPrice());
        $cart->setCustomerComment($order->getCustomerComment());
        $cart->setAffiliateCode($order->getAffiliateCode());
        $cart->setCampaignCode($order->getCampaignCode());