public function getRoles($user_id) {
        $results = $this->find('all', array(
            'conditions' => array(
                'RequestObject.foreign_key' => $user_id,
                'RequestObject.model' => USER_MODEL
            )
        ));

        if ($results) {
            // Grab the direct parents (or roles)
            $results = $this->find('all', array(
                'conditions' => array('RequestObject.id' => Hash::extract($results, '{n}.RequestObject.parent_id'))
            ));

            // Also grab the children of the parents since the user has access to them as well
            $results = array_merge($results, $this->find('all', array(
                'conditions' => array(
                    'RequestObject.parent_id' => Hash::extract($results, '{n}.RequestObject.id'),
                    'RequestObject.model' => null,
                    'RequestObject.foreign_key' => null
                )
            )));
        }

        return $results;
    }