<?php defined('SYSPATH') or die('No direct script access.');
class Model_User extends Model_Auth_User {
    protected $_has_many = array(
        'user_tokens' => array('model' => 'user_token'),
        'roles'       => array('model' => 'role', 'through' => 'roles_users'),
        'pictures'    => array('model' => 'picture'),
    );

class Model_Picture extends ORM
{
    protected $_belongs_to = array(
        'user' => array(
            'foreign_key' => 'id',
        ),
    );

    protected $_has_many = array(
        'comments' => array('model' => 'comment')
    );

class Model_Comment extends ORM
{
    protected $_belongs_to = array(
        'picture' => array(
            'foreign_key' => 'id',
        ),
    );