Sulu\Component\Rest\ListBuilder\Doctrine\DoctrineListBuilder::assignSortFields PHP Method

    protected function assignSortFields($queryBuilder)
    {
        // if no sort has been assigned add order by id ASC as default
        if (count($this->sortFields) === 0) {
            $queryBuilder->addOrderBy($this->entityName . '.id', 'ASC');
        }
        foreach ($this->sortFields as $index => $sortField) {
            $statement = $sortField->getSelect() . ' AS ' . $sortField->getName();
            if (!$this->hasSelectStatement($queryBuilder, $statement)) {
                $queryBuilder->addSelect($sortField->getSelect() . ' AS HIDDEN ' . $sortField->getName());
            }
            $queryBuilder->addOrderBy($sortField->getName(), $this->sortOrders[$index]);
        }
    }