public function add_friend($friend, $group)
{
if (!$this->username) {
return array('r' => 'error', 'e' => 'no session found');
}
$friend = new Friend($this->username, $friend, $group);
$friend_obj_id = $friend->save();
if ($friend_obj_id) {
$friend_arr = Friend::get($friend_obj_id);
$this->memcache->set('user/' . $this->username . '/friends/add', json_encode($friend_arr));
return array('r' => 'added');
} else {
return array('r' => 'error', 'e' => 'invalid user');
}
}