SwitchPriceAttributeScopeOnConfigChange.php

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<?php
namespace Magento\Catalog\Observer;

use Magento\Framework\Event\Observer as EventObserver;
use Magento\Framework\Event\ObserverInterface;
use Magento\Catalog\Api\Data\ProductAttributeInterface;
use Magento\Catalog\Api\ProductAttributeRepositoryInterface;
use Magento\Store\Model\Store;
use Magento\Framework\App\Config\ReinitableConfigInterface;
use Magento\Framework\Api\SearchCriteriaBuilder;

class SwitchPriceAttributeScopeOnConfigChange implements ObserverInterface
{
    private $config;

    private $productAttributeRepository;

    private $searchCriteriaBuilder;

    public function __construct(
        ReinitableConfigInterface $config,
        ProductAttributeRepositoryInterface $productAttributeRepository,
        SearchCriteriaBuilder $searchCriteriaBuilder
    ) {
        $this->config = $config;
        $this->productAttributeRepository = $productAttributeRepository;
        $this->searchCriteriaBuilder = $searchCriteriaBuilder;
    }

    public function execute(EventObserver $observer)
    {
        $this->searchCriteriaBuilder->addFilter('frontend_input', 'price');
        $criteria = $this->searchCriteriaBuilder->create();

        $scope = $this->config->getValue(Store::XML_PATH_PRICE_SCOPE);
        $scope = ($scope == Store::PRICE_SCOPE_WEBSITE)
            ? ProductAttributeInterface::SCOPE_WEBSITE_TEXT
            : ProductAttributeInterface::SCOPE_GLOBAL_TEXT;

        $priceAttributes = $this->productAttributeRepository->getList($criteria)->getItems();

        foreach ($priceAttributes as $priceAttribute) {
            $priceAttribute->setScope($scope);
            $this->productAttributeRepository->save($priceAttribute);
        }
    }
}