Magento 2: Change quote currency code before place order with Observer

Question

I am trying to change the quote currency before placing any order.

I have used below event for that.

Vendor\Module\etc\frontend\events.xml

<event name="sales_model_service_quote_submit_before">
    <observer name="change_currency_before_place_order" instance="Vendor\Module\Observer\BeforePlaceOrder" />
</event>

Vendor\Module\Observer\BeforePlaceOrder.php

<?php

namespace Vendor\Module\Observer;
use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;
class BeforePlaceOrder implements ObserverInterface
{    

 protected $_checkoutSession;
 private $logger;
/**
 * @var \Magento\Catalog\Model\Session
 */
 protected $catalogSession;

public function __construct(
    \Magento\Checkout\Model\Session $checkoutSession,
    \Magento\Catalog\Model\Session $catalogSession,
    \Psr\Log\LoggerInterface $logger
)
{   
    $this->_checkoutSession = $checkoutSession;
    $this->catalogSession = $catalogSession;
    $this->logger = $logger;
}

public function execute(\Magento\Framework\Event\Observer $observer)
{   
   $quote = $observer->getEvent()->getQuote(); 
   $this->logger->info('inside place order observer');
   //$this->storeManager->getStore()->setCurrentCurrencyCode('EUR'); 
   $quote->setQuoteCurrencyCode("EUR"); 
   $quote->collectTotals();
  }
}

The above event is not firing for me, Is there any other way to implement this functionality?

Note: The accepted answer working well but once the invoice is created, its changing to default currency again.

Can anyone advise me please why that event is not firing even after placing globally?.

Answer 1

Give a try with below code.

events.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="sales_order_save_commit_after">
    <observer name="sumit_custom_order_currency" instance="Vendor\Module\Observer\OrderSaveCommitAfter" />
</event>
</config>

OrderSaveCommitAfter.php

namespace Vendor\Module\Observer;

use Magento\Framework\Event\ObserverInterface;

class OrderSaveCommitAfter implements ObserverInterface
{
    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        /* @var $order Order */
        $order = $observer->getEvent()->getOrder();

        if (!$order->getId()) {
            //order not saved in the database
            return;
        }
        $order->setBaseCurrencyCode('EUR');
        $order->setGlobalCurrencyCode('EUR');
        $order->setOrderCurrencyCode('EUR');
        $order->setStoreCurrencyCode('EUR');
        $order->save();
    }
}

Hope it helps!!!

Answer 2

This is a work around use Plugin instead of Observer.

Vendor/Module/etc/di.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">

<type name="Magento\Sales\Api\OrderRepositoryInterface">
    <plugin name="Module_OrderAfterSave" type="Vendor\Module\Plugin\OrderAfterSave" sortOrder="10" disabled="false" />
</type>

Then Vendor\Module\Plugin\OrderAfterSave.php

<?php
namespace Vendor\Module\Plugin;

use Magento\Sales\Api\OrderRepositoryInterface;
use Magento\Sales\Api\Data\OrderInterface;
use Magento\Framework\ObjectManagerInterface;

class OrderAfterSave
{
private $logger;
protected $objectManager;
protected $orderRepositoryInterface;
protected $_coreSession;

public function __construct(
    ObjectManagerInterface $objectManager,
    OrderRepositoryInterface $orderRepositoryInterface,
    \Psr\Log\LoggerInterface $logger,
    \Magento\Framework\Session\SessionManagerInterface $coreSession
) {
    $this->objectManager = $objectManager;
    $this->orderRepositoryInterface = $orderRepositoryInterface;
    $this->logger = $logger;
    $this->_coreSession = $coreSession;
}

public function afterSave(\Magento\Sales\Api\OrderRepositoryInterface $orderRepo, $order)
{
    $currencyCode = 'EUR';

    $order->setBaseCurrencyCode($currencyCode);
    $order->setGlobalCurrencyCode($currencyCode);
    $order->setOrderCurrencyCode($currencyCode);
    $order->setStoreCurrencyCode($currencyCode);
    $order->save();

    return $order;
}

I hope this will help you!!