CodeIgniter Ion Auth - set_hooks example

gistfile1.aw

//this would probably be in a library or model
class activity
{
    function add($type)
    {
        $this->db->insert('activity', array(
            'type'     => $type,
            'datetime' => 'now()',
        ));
    }
}

//set the hook
$this->ion_auth->set_hook('post_register', 'add_meta', 'activity', 'add', array('user_added'));

//other stuff...

//after this is called the hook will be executed automatically
$this->ion_auth->register(...

thanks

Can I have the hooked method in one controller and set_hook() run from another controller?

Is there a way for me to pass data in the present ion-auth function into my own function? i want to hash both the activation code and the id found in the link sent to user's email addresses, in order to activate their account. Then inside the activate (inside ion-auth-model) i want to 'un-hash' it so that ion-auth flow can continue as normal..

Hello,@benedmunds
I can run your example. The data in the table is entered correctly.by:
$this->ion_auth->set_hook('post_register', 'add_meta', 'activity', 'add', array('user_added'));
But why does not the following command answer?
$this->ion_auth->set_hook('post_activate', 'add_meta', 'activity', 'add', array('user_added'));
And i reviewed the following. The correct operation is not done.

$this->ion_auth->set_hook(array('post_activate', 'post_activate_successful'), 'add_meta',  'activity', 'add', array('user_added'));
$this->ion_auth->set_hook('post_activate_successful', 'add_meta',  'activity', 'add', array('user_added'));

please guide me?