__weak __typeof__(self) weakSelf = self;
[self.notificationManager addObserverForUpdatedModel:self.message block:^(NSNotification *notification) {
    __typeof__(self) strongSelf = weakSelf;
    Message *newMessage = (Message *)notification.object;
    strongSelf.usersInMessageThread = newMessage.users;
    [strongSelf.tableView reloadData];
}];