Nextras\Orm\Collection\EntityIterator::setDataIndex PHP Метод

    public function setDataIndex($index)
    {
        if (isset($index)) {
            if (!isset($this->data[$index])) {
                $this->data[$index] = [];
            }
            $this->iteratable =& $this->data[$index];
            $this->hasSubarray = true;
        } else {
            $this->iteratable =& $this->data;
            $this->hasSubarray = false;
        }
        $this->rewind();
    }