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<?php
/**
* Bitrix Framework
* @package bitrix
* @subpackage main
* @copyright 2001-2020 Bitrix
*/
namespace Bitrix\Iblock\ORM;
use Bitrix\Main\ORM\Fields\ExpressionField;
use Bitrix\Main\ORM\Objectify\Collection;
use Bitrix\Main\ORM\Objectify\EntityObject;
/**
* @package bitrix
* @subpackage main
*/
class FairLimitSelector
{
/**
* @param \Bitrix\Main\ORM\Query\Query $query
*
* @return Collection|null
* @throws \Bitrix\Main\ArgumentException
* @throws \Bitrix\Main\ObjectPropertyException
* @throws \Bitrix\Main\SystemException
*/
public static function fetchCollection($query)
{
$select = $query->getSelect();
$query->setSelect([new ExpressionField('DISTINCT_ID', 'DISTINCT %s', 'ID')]);
$query->addGroup('ID');
// get elements data
$ids = [];
foreach ($query->exec()->fetchAll() as $row)
{
$ids[] = $row['DISTINCT_ID'];
}
/** @var Collection $elements */
$dataClass = $query->getEntity()->getDataClass();
$elements = $dataClass::createCollection();
if (!empty($ids))
{
$query = $dataClass::query();
$query->setSelect($select);
$query->whereIn('ID', $ids);
$resultElements = [];
foreach ($query->fetchCollection() as $elementObject)
{
/** @var EntityObject $elementObject */
$resultElements[$elementObject->getId()] = $elementObject;
}
// original sort
foreach ($ids as $id)
{
$elements->sysAddActual($resultElements[$id]);
}
}
return $elements;
}
}