public function insert(UserModel $user)
{
$data = array('user_id' => $user->getUserId(), 'email' => $user->getEmail(), 'display_name' => $user->getDisplayName(), 'password' => $user->getPassword(), 'salt' => $user->getSalt(), 'register_time' => new Expr('NOW()'), 'register_ip' => new Expr("INET_ATON('{$_SERVER['REMOTE_ADDR']}')"));
$db = $this->getWriteAdapter();
$db->insert($this->getTableName(), $data);
$userId = $db->lastInsertId();
$user->setUserId($userId);
return $user;
}