basemergetrait.php

См. документацию.

<?php
 
namespace Bitrix\Main\ORM\Data\AddStrategy\Internal;
 
use Bitrix\Main\ORM\Data\AddStrategy\Contract\AddStrategy;
use Bitrix\Main\ORM\Data\AddStrategy\Merge;
use Bitrix\Main\ORM\Data\DataManager;

trait BaseMergeTrait
{
    private static array $mergeStrategyCache = [];
 
    private static function getCachedMergeStrategy(): AddStrategy
    {
        self::$mergeStrategyCache[static::class] ??= static::getMergeStrategy();
 
        return self::$mergeStrategyCache[static::class];
    }
 
    protected static function getMergeStrategy(): AddStrategy
    {
        return new Merge(static::getEntity());
    }
}