comment form submission - return to same page

[eluser]Unknown[/eluser]
Hello!
how can i redirect my page to the current url after submitting the comment form?

This is the controller function:

Code:

$this->rehber_model->comment();
redirect('this-one-should-be-dynamic');

This is the model function:

Code:

public function comment()
{
$data = array('comment' => $this->input->post('comment'));
return $this->db->insert('comments', $data);
}

Or any other idea for comment system?