ReadHandler.php

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<?php
namespace Magento\SalesRule\Model\ResourceModel;

use Magento\SalesRule\Model\ResourceModel\Rule;
use Magento\Framework\EntityManager\MetadataPool;
use Magento\Framework\EntityManager\Operation\AttributeInterface;

class ReadHandler implements AttributeInterface
{
    protected $ruleResource;

    protected $metadataPool;

    public function __construct(
        Rule $ruleResource,
        MetadataPool $metadataPool
    ) {
        $this->ruleResource = $ruleResource;
        $this->metadataPool = $metadataPool;
    }

    public function execute($entityType, $entityData, $arguments = [])
    {
        $linkField = $this->metadataPool->getMetadata($entityType)->getLinkField();
        $entityId = $entityData[$linkField];

        $entityData['customer_group_ids'] = $this->ruleResource->getCustomerGroupIds($entityId);
        $entityData['website_ids'] = $this->ruleResource->getWebsiteIds($entityId);

        return $entityData;
    }
}