# Zapamituje uytkownika, aby zalogowa go w przyszoci
def remember!(cookies)
  cookie_expiration = 10.years.from_now
  cookies[:remember_me] = { :value => "1",
                            :expires => cookie_expiration }
        self.authorization_token = unique_identifier 
        save!
        cookies[:authorization_token] = {
            :value => authorization_token,
            :expires => cookie_expiration }
end

private

# Generuje unikatowy identyfikator uytkownika
def unique_identifier
  Digest::SHA1.hexdigest("#{self.screen_name}:#{self.password}")
end

