使用 Devise 逐步参与、持续的访客用户

Question

我正在尝试在我的实用程序应用程序中建立逐步参与，人们无需注册即可使用它，例如notepad.cc 和 jsfiddle.net，我计划在用户“写入”应用程序时为用户创建一个访客用户（使用 Devise）。

我在 Devise wiki https://github.com/plataformatec/devise/wiki/How-To:-Create-a-guest-user 上找到了本指南，该指南展示了如何在浏览器会话期间创建访客用户。我希望用户在后续访问中继续使用相同的访客帐户，直到他注册，也许当我介绍更多功能的订阅计划时。

如何修改指南中的内容才能实现这一点？

上面链接的指南中的代码：

# file: app/controllers/application_controller.rb

class ApplicationController < ActionController::Base

  protect_from_forgery

  # if user is logged in, return current_user, else return guest_user
  def current_or_guest_user
    if current_user
      if session[:guest_user_id]
        logging_in
        guest_user.destroy
        session[:guest_user_id] = nil
      end
      current_user
    else
      guest_user
    end
  end

  # find guest_user object associated with the current session,
  # creating one as needed
  def guest_user
    User.find(session[:guest_user_id].nil? ? session[:guest_user_id] = create_guest_user.id : session[:guest_user_id])
  end

  # called (once) when the user logs in, insert any code your application needs
  # to hand off from guest_user to current_user.
  def logging_in
  end

  private
  def create_guest_user
    u = User.create(:name => "guest", :email => "guest_#{Time.now.to_i}#{rand(99)}@email_address.com")
    u.save(false)
    u
  end

end

并在控制器中使用它：

@thing.user = current_or_guest_user
@thing.save

Answer 1

在给牦牛剃毛后，我设法让它工作了。这是工作代码：

class ApplicationController < ActionController::Base

  protect_from_forgery

  # if user is logged in, return current_user, else return guest_user
  def current_or_guest_user
    if current_user
      if cookies[:uuid]
        logging_in # Look at this method to see how handing over works
        guest_user.destroy # Stuff have been handed over. Guest isn't needed anymore.
        cookies.delete :uuid # The cookie is also irrelevant now
      end
      current_user
    else
      guest_user
    end
  end

  # find guest_user object associated with the current session,
  # creating one as needed
  def guest_user
      User.find_by_lazy_id(cookies[:uuid].nil? ? create_guest_user.lazy_id : cookies[:uuid])
  end

  # called (once) when the user logs in, insert any code your application needs
  # to hand off from guest_user to current_user.
  def logging_in
      # What should be done here is take all that belongs to user with lazy_id matching current_user's uuid cookie... then associate them with current_user
  end

  private

    def create_guest_user
        uuid = rand(36**64).to_s(36)
        temp_email = "guest_#{uuid}@email_address.com"
        u = User.create(:email => temp_email, :lazy_id => uuid)
        u.save(:validate => false)
        cookies[:uuid] = { :value => uuid, :path => '/', :expires => 5.years.from_now }
        u
      end

end

如果你能告诉我一个更好的方法，我会接受另一个答案。

Answer 2

上述解决方案效果很好。

不要忘记 setuphelper_method :current_or_guest_user 以使该方法在视图中可访问。我花了一些时间才弄清楚。