CodeIgniter - 来自第二个数据库的单行查询

I would like to get single row from another database than default (second database is connected in database.php and its working with another controller).

My model:

public function pobierz( $id_kontaktu )
{


    $osoby = $this->load->database('osoby', TRUE);
    return $osoby->where('id_osoby', $id_kontaktu)->row();


}

My controller:

public function kontakt()
{
    $data['kontakt_id'] = $this->uri->segment(3);   

    $kontakt = $this->Aktualizacja_m->pobierz( $data['kontakt_id'] );   
    echo $kontakt->email1;
}

Error:

Fatal error: Call to undefined method CI_DB_mysqli_driver::row() in ... A PHP Error was encountered

Severity: Error

Message: Call to undefined method CI_DB_mysqli_driver::row()

Filename: models/Aktualizacja_m.php

Line Number: 21

Backtrace:

You are not selecting table name

public function pobierz( $id_kontaktu )
{
     $osoby = $this->load->database('osoby', TRUE);
     return $osoby->where('id_osoby', $id_kontaktu)->get('TABLE_NAME')->row_object();
}