usertypefield.php

<?php
namespace Bitrix\Main\ORM\Fields;
use Bitrix\Main\ArgumentException;
 
class UserTypeField extends ExpressionField
{
    protected $isMultiple = false;
 
    public function cast($value)
    {
        if ($this->isMultiple)
        {
            if ($value !== false && $value !== null) // empty value for multiple field
            {
                //if (!\is_iterable($value)) PHP 7
                if (!is_array($value) && !($value instanceof \Traversable))
                {
                    throw new ArgumentException(sprintf(
                        'Expected iterable value for multiple field, but got `%s` instead', gettype($value)
                    ));
                }
 
                // array of values
                foreach ($value as &$_value)
                {
                    $_value = $this->valueField->getUtmField()->cast($_value);
                }
            }
 
            return $value;
        }
        else
        {
            return parent::cast($value);
        }
    }
 
    public function getTypeMask()
    {
        return FieldTypeMask::USERTYPE;
    }
 
    public function configureMultiple($isMultiple = true)
    {
        $this->isMultiple = (bool) $isMultiple;
        return $this;
    }
 
    public function isMultiple()
    {
        return $this->isMultiple;
    }
 
    public function convertValueToDb($value)
    {
        return $this->isMultiple
            ? $this->getConnection()->getSqlHelper()->convertToDbString($value) // serialized values
            : parent::convertValueToDb($value);
    }
 
    public function getFetchDataModifiers()
    {
        $srcField = $this->getBuildFromChains()[0]->getLastElement()->getValue();
 
        return array_merge(parent::getFetchDataModifiers(), $srcField->getFetchDataModifiers());
    }
 
    public function getSaveDataModifiers()
    {
        $srcField = $this->getBuildFromChains()[0]->getLastElement()->getValue();
 
        return array_merge(parent::getSaveDataModifiers(), $srcField->getSaveDataModifiers());
    }
}