CatalogAttributeDeleteAfterObserver.php

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<?php
namespace Magento\SalesRule\Observer;

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

class CatalogAttributeDeleteAfterObserver implements ObserverInterface
{
    protected $checkSalesRulesAvailability;

    public function __construct(
        \Magento\SalesRule\Observer\CheckSalesRulesAvailability $checkSalesRulesAvailability
    ) {
        $this->checkSalesRulesAvailability = $checkSalesRulesAvailability;
    }

    public function execute(EventObserver $observer)
    {
        $attribute = $observer->getEvent()->getAttribute();
        if ($attribute->getIsUsedForPromoRules()) {
            $this->checkSalesRulesAvailability->checkSalesRulesAvailability($attribute->getAttributeCode());
        }

        return $this;
    }
}