Magento 2：從訂單觀察員以編程方式創建發票

Question

我正在Magento 2.2.3上進行測試，並且為事件sales_order_save_after創建了一個觀察器，之后該事件將用於自動創建發票。

這是下訂單后收到的當前錯誤：

Order saving error: Rolled back transaction has not been completed correctly.

還有我的MyCompany/MyModule/Observer/SalesOrderSaveAfter.php

<?php
namespace MyCompany\MyModule\Observer;

use Magento\Framework\Event\ObserverInterface;

class SalesOrderSaveAfter implements ObserverInterface
{
    protected $_invoiceService;
    protected $_transactionFactory;

    public function __construct(
      \Magento\Sales\Model\Service\InvoiceService $invoiceService,
      \Magento\Framework\DB\TransactionFactory $transactionFactory
    ) {
       $this->_invoiceService = $invoiceService;
       $this->_transactionFactory = $transactionFactory;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $order = $observer->getEvent()->getOrder();

        try {
            if(!$order->canInvoice()) {
                return null;
            }
            if(!$order->getState() == 'new') {
                return null;
            }

            $invoice = $this->_invoiceService->prepareInvoice($order);
            $invoice->setRequestedCaptureCase(\Magento\Sales\Model\Order\Invoice::CAPTURE_ONLINE);
            $invoice->register();

            $transaction = $this->_transactionFactory->create()
              ->addObject($invoice)
              ->addObject($invoice->getOrder());

            $transaction->save();

        } catch (\Exception $e) {
            $order->addStatusHistoryComment('Exception message: '.$e->getMessage(), false);
            $order->save();
            return null;
        }
    }
}

如果我刪除代碼的交易部分，例如：

$transaction = $this->_transactionFactory->create()
    ->addObject($invoice)
    ->addObject($invoice->getOrder());

    $transaction->save();

則訂單將通過標記為已開具發票的產品通過，但實際上並未創建或保存任何發票。

有什么想法我可能會錯過嗎？

Answer 1

https://magento.stackexchange.com/questions/217045/magento-2-how-to-automatically-create-invoice-from-order-observer

答案是我使用了錯誤的事件。 對於事件sales_order_save_after該訂單尚未提交到數據庫。

我將事件更改為在checkout_submit_all_after觸發，我的觀察器現在正在工作。