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namespace Model;

class Auth_User extends \Auth\Model\Auth_User
{
	protected static $_observers = array(
		'Orm\\Observer_CreatedAt' =--> array(
			'events' => array('before_insert'),
			'property' => 'created_at',
			'mysql_timestamp' => false
		),
		'Orm\\Observer_UpdatedAt' => array(
			'events' => array('before_update'),
			'property' => 'updated_at',
			'mysql_timestamp' => false
		),
		'Orm\\Observer_Typing' => array(
			'events' => array('after_load', 'before_save', 'after_save')
		),
		'Orm\\Observer_Self' => array(
			'events' => array('before_insert', 'before_update'),
			'property' => 'user_id'
		),
		'Orm\\Observer_Slug' => array(
			'events' => array('before_insert'),
			'source' => 'username',
			'property' => 'slug'
		),
	);
}

Autoloader::add_classes(array(
	'Model\\Auth_User' => APPPATH . 'classes/model/auth/user.php',
));

I'm adding the slug observer so that when a new user is added using the Auth::create_user method, a slug is automatically generated

<?php

namespace Model;

class Auth_User extends \Auth\Model\Auth_User
{
    public static function _init()
    {
        die('loaded');
    }
}

Autoloader::add_classes(array(
    'Model\Auth_User'            => APPPATH.'classes/model/auth/user.php',
));

<?php

namespace Model;

class Auth_User extends \Auth\Model\Auth_User
{
    public static function _init()
    {
        static::$_observers['Orm\\Observer_Slug'] = array(
            'events' => array('before_insert'),
            'source' => 'username',
            'property' => 'slug'
        );

        parent::_init();
    }
}