ProductVariationProvider.php

<?php
 
namespace Bitrix\Catalog\v2\Integration\UI\EntitySelector;
 
use Bitrix\UI\EntitySelector\Dialog;
 
class ProductVariationProvider extends ProductProvider
{
    protected const ENTITY_ID = 'product_variation';
 
    public function fillDialog(Dialog $dialog): void
    {
        $dialog->loadPreselectedItems();
    }
 
    protected function getProductsBySearchString(string $searchString = ''): array
    {
        if (trim($searchString) === '')
        {
            return [];
        }
 
        $iblockInfo = $this->getIblockInfo();
        if (!$iblockInfo)
        {
            return [];
        }
 
        $productFilter = [
            [
                'LOGIC' => 'OR',
                '*SEARCHABLE_CONTENT' => $searchString,
                'PRODUCT_BARCODE' => $searchString . '%',
            ]
        ];
 
        $products = $this->getProducts([
            'filter' => $productFilter,
            'searchString' => $searchString,
            'load_offers' => false,
        ]);
 
        if ($iblockInfo->canHaveSku())
        {
            $subQueryPropererties = [
                'CHECK_PERMISSIONS' => 'Y',
                'MIN_PERMISSION' => 'R',
                'ACTIVE' => 'Y',
                'ACTIVE_DATE' => 'Y',
                'IBLOCK_ID' => $iblockInfo->getSkuIblockId(),
                '*SEARCHABLE_CONTENT' => $searchString,
            ];
 
            $productFilter = [
                [
                    'LOGIC' => 'OR',
                    '*SEARCHABLE_CONTENT' => $searchString,
                    'PRODUCT_BARCODE' => $searchString . '%',
                    '=ID' => \CIBlockElement::SubQuery('PROPERTY_' . $iblockInfo->getSkuPropertyId(), $subQueryPropererties),
                ]
            ];
 
            if (!empty($products))
            {
                $productFilter[] = [
                    '!=ID' => array_keys($products),
                ];
            }
 
            $offersFilter = [
                [
                    'LOGIC' => 'OR',
                    '*SEARCHABLE_CONTENT' => $searchString,
                    'PRODUCT_BARCODE' => $searchString . '%',
                ]
            ];
 
            $offers = $this->getProducts([
                'filter' => $productFilter,
                'offer_filter' => $offersFilter,
                'searchString' => $searchString,
            ]);
 
            array_push($products, ...$offers);
        }
 
        return $products;
    }
}