Event fire before save invoice in `sales_invoice` table

Question

I want to save value in sales_invoice table of custom attribute ("current_seller_id"). i want to know any event that fire before save the invoice in sales_invoice table or use plugin of which method. . I already done like this functionality in sales_order table via using event sales_model_service_quote_submit_before code is give below .

public function execute(\Magento\Framework\Event\Observer $observer)
{
    $order = $observer->getData('order');
    $quote = $observer->getData('quote');
    $quoteItems = $quote->getItems();
    foreach ($quoteItems as $quoteItem){
        if ($quoteItem->getCurrentSellerId() != ""){
            $items[]=$quoteItem->getCurrentSellerId();
        }
    }
    $seller_ids=implode(',',$items);
    $order->setCurrentSellerId($seller_ids);
    return $this;
}

Same i want to do with sales_invoice table. Can anyone guide me ?

Answer 1

If you want to be in sync with your code you already have implemented in Observer or plugin use before the invoice creation you should use for this also a plugin method after Magento\Sales\Model\Order\Invoice::register(). This is the method wich calls also the register method for each item.

So if you create the plugin method after Magento\Sales\Model\Order\Invoice::register() you will have all the current seller IDs of the invoice items and can access them there.

The plugin function could be something like this:

public function afterRegister(\Magento\Sales\Model\Order\Invoice $subject, $result)
{
    $items = [];
    foreach ($result->getAllItems() as $item) {
        $items[]=$item->getCurrentSellerId();
    }
    $seller_ids=implode(',',$items);
    $result->setCurrentSellerId($seller_ids);

    return $result;
}

It is almost the same action point as using the sales_order_invoice_register event but the recommended way to change data is to use plugins.