CustomAttributesFlattener.php

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<?php
declare(strict_types=1);

namespace Magento\CatalogGraphQl\Model\Resolver\Products\DataProvider;

class CustomAttributesFlattener
{
    public function flatten(array $categoryData) : array
    {
        if (!isset($categoryData['custom_attributes'])) {
            return $categoryData;
        }

        foreach ($categoryData['custom_attributes'] as $attributeData) {
            $categoryData[$attributeData['attribute_code']] = $attributeData['value'];
        }

        unset($categoryData['custom_attributes']);

        return $categoryData;
    }
}