ConfigurableProductHandler.php

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<?php
namespace Magento\CatalogRuleConfigurable\Plugin\CatalogRule\Model\Rule;

use Magento\ConfigurableProduct\Model\Product\Type\Configurable;
use Magento\CatalogRuleConfigurable\Plugin\CatalogRule\Model\ConfigurableProductsProvider;

class ConfigurableProductHandler
{
    private $configurable;

    private $configurableProductsProvider;

    private $childrenProducts = [];

    public function __construct(
        \Magento\ConfigurableProduct\Model\ResourceModel\Product\Type\Configurable $configurable,
        ConfigurableProductsProvider $configurableProductsProvider
    ) {
        $this->configurable = $configurable;
        $this->configurableProductsProvider = $configurableProductsProvider;
    }

    public function afterGetMatchingProductIds(\Magento\CatalogRule\Model\Rule $rule, array $productIds)
    {
        $configurableProductIds = $this->configurableProductsProvider->getIds(array_keys($productIds));
        foreach ($configurableProductIds as $productId) {
            if (!isset($this->childrenProducts[$productId])) {
                $this->childrenProducts[$productId] = $this->configurable->getChildrenIds($productId)[0];
            }
            $subProductIds = $this->childrenProducts[$productId];
            $parentValidationResult = isset($productIds[$productId])
                ? array_filter($productIds[$productId])
                : [];
            foreach ($subProductIds as $subProductId) {
                $childValidationResult = isset($productIds[$subProductId])
                    ? array_filter($productIds[$subProductId])
                    : [];
                $productIds[$subProductId] = $parentValidationResult + $childValidationResult;
            }
            unset($productIds[$productId]);
        }
        return $productIds;
    }
}