elementv1.php

<?php
namespace Bitrix\Iblock\ORM;
 
use Bitrix\Iblock\ORM\Fields\PropertyReference;
use Bitrix\Main\ORM\Data\Result;
use Bitrix\Main\ORM\Objectify\EntityObject;
use Bitrix\Main\ORM\Objectify\State;
 
abstract class ElementV1 extends CommonElement
{
    public function sysSetValue($fieldName, $value)
    {
        $field = $this->entity->getField($fieldName);
 
        if ($field instanceof PropertyReference)
        {
            // for v1 preferable to change existing object (sel+upd) instead of new (del+ins)
            if ($this->state !== State::RAW && !$this->sysIsFilled($fieldName))
            {
                $this->fill($fieldName);
            }
        }
 
        return parent::sysSetValue($fieldName, $value);
    }
 
    public function sysSaveRelations(Result $result)
    {
        parent::sysSaveRelations($result);
 
        // save single value references
        foreach ($this->entity->getFields() as $field)
        {
            if ($field instanceof PropertyReference)
            {
                if ($this->sysHasValue($field->getName()) && !empty($this->get($field->getName())))
                {
                    $valueObject = $this->get($field->getName());
 
                    if ($valueObject->state == State::RAW)
                    {
                        // previously we made fill, so now we don't need to remove old value
                        // it would be insert only, and that's all
                        $valueObject->save();
                    }
                    elseif ($valueObject->state == State::CHANGED)
                    {
                        // regular update
                        $valueObject->save();
                    }
                }
            }
        }
    }
}