收到IPN后更新订单栏

Question

我正在将Paypal IPN集成到我的市场应用程序中。我一直在与MVC架构进行斗争，试图让它发挥作用。

我希望在收到＆＃34; VERIFIED＆＃34;的IPN响应后更新订单数据库中的a：created_at列。然后Order模型将使用回调来保存创建操作后的顺序：purchase_at列不是nil。

我的想法是使用IPN响应将订单保存到数据库，但我无法弄清楚如何使控制器/模型正常通信。

PaymentNotificationsController

class PaymentNotificationsController < ApplicationController
  protect_from_forgery :except => [:create] #Otherwise the request from PayPal wouldn't make it to the controller
  def create
    response = validate_IPN_notification(request.raw_post)
    case response
    when "VERIFIED"
      order.update_attribute(:purchased_at, Time.now)
    when "INVALID"
    else
    end
    render :nothing => true
  end

  protected
  def validate_IPN_notification(raw)
    uri = URI.parse('https://ipnpb.sandbox.paypal.com/cgi-bin/webscr?cmd=_notify-validate')
    http = Net::HTTP.new(uri.host, uri.port)
    http.open_timeout = 60
    http.read_timeout = 60
    http.verify_mode = OpenSSL::SSL::VERIFY_NONE
    http.use_ssl = true
    response = http.post(uri.request_uri, raw,
                         'Content-Length' => "#{raw.size}",
                         'User-Agent' => "My custom user agent"
                       ).body
  end

end

PaymentNotification.rb

class PaymentNotification < ApplicationRecord
  belongs_to :order
end

Order.rb

class Order < ApplicationRecord
  belongs_to :item
  belongs_to :buyer, class_name: "User"
  belongs_to :seller, class_name: "User"
  after_create :purchased?

    private

    def purchased?
      if :purchased_at != nil
        order.save
      end
    end
end