Codeigniter HMVC + datamapper

I'm facing a problem when I'm using datamapper with codegniter and HMVC module. It didnt work for MX_CONTROLLER .. c

I have followed these steps: http://stensi.com/datamapper/pages/installation.html I have created two modules.

Albums_model:

<?php
class albums_model extends DataMapper {

    var $has_many = array('photos_model');
    public $table = 'albums';

}
?>

And photos_model:

<?php
class photos_model extends DataMapper {

    public $table = 'photos';
    public $validation= array(
     array(
        'field' => 'title',
        'label' => 'Title',
        'rules'=>array('required')
    )
);
?>

Photos controller:

<?php
class Photos extends MX_Controller
{
    public function __construct()
    {
        parent::__construct();
        $this->load->model('photos_model');
    }

    function index()
    {
        $p=new photos_model();
        $p= $this->photos_model->get();
        print_r($p);
    }
 }
?>

Where is the problem? Can anyone help me?

By the way, is there any $belong_to option similar to cakephp?

These two lines of code are redundant.

$p=new photos_model();
$p= $this->photos_model->get();

Based on the examples given here: http://stensi.com/datamapper/pages/gettingstarted.html

I believe you would want to do:

$p->get();

In place of that second line.