AddSalesRuleNameToOrderObserver.php

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<?php
namespace Magento\SalesRule\Observer;

use Magento\Framework\Event\Observer as EventObserver;
use Magento\Framework\Event\ObserverInterface;

class AddSalesRuleNameToOrderObserver implements ObserverInterface
{
    protected $_ruleFactory;

    protected $_coupon;

    public function __construct(
        \Magento\SalesRule\Model\RuleFactory $ruleFactory,
        \Magento\SalesRule\Model\Coupon $coupon
    ) {
        $this->_ruleFactory = $ruleFactory;
        $this->_coupon = $coupon;
    }

    public function execute(EventObserver $observer)
    {
        $order = $observer->getOrder();
        $couponCode = $order->getCouponCode();

        if (empty($couponCode)) {
            return $this;
        }

        $this->_coupon->loadByCode($couponCode);
        $ruleId = $this->_coupon->getRuleId();

        if (empty($ruleId)) {
            return $this;
        }

        $rule = $this->_ruleFactory->create()->load($ruleId);
        $order->setCouponRuleName($rule->getName());

        return $this;
    }
}