Many to many Models

class Category extends ActiveRecord\Model {
    static $has_many = array(
        array('eventcategories'),
            array('events', 'foreign_key' => 'event_id',
                array('through' => 'eventcategories', 'foreign_key' => 'event_id')
    ));
}

class Event extends ActiveRecord\Model {
    static $has_many = array(
        array('categories', 'through' => 'eventcategories', 'foreign_key' => 'event_id')
    );
}

class Eventcategory extends ActiveRecord\Model {
    static $belongs_to = array(
        array('event'),
        array('category')
    );
}