PayPal’s IPN (Instant Payment Notification) service allows your app to get confirmation when an order is processed. In this episode I use IPN to mark a cart as purchased.
当一次商品订购完成后,PayPal的IPN(即时付款通知)服务允许你的程序上获得一个通知.在这个视频里,我使用了IPN来标志购物车已经进行了商品购置.

This episode shows how create a weblog with posts and comments with Rails 2.
这个视频为你演示了如何用Rails 2创建博客.

Selenium is a great way to test your app automatically through a browser. See how it works in this episode.
Selenium是一个通过浏览器自动测试程序的工具.这个视频里讲述Selenium如何运行.

You know those invitation systems where a given user can invite a number of other people to join? That’s what I show you how to make in this episode.
你知道用户可以邀请一定数量的其他用户加入的邀请系统吗?在这个视频里将教你如何创建.

This episode shows how to encrypt the variables passed to PayPal and verify the authenticity of the payment notifications (IPN).
这个视频演示了如何加密传递到PayPal的变量,和验证支付通知的真伪.

If you want Rails to behave a certain way, try changing it and submitting a patch. This episode will show how to do exactly this using Git.
如果你想要Rails以特定方式运转,尝试改变它,并提交一个patch.这个视频讲述了如何正确使用Git.

If you’re running a production site, it’s a good idea to record all exceptions which occur. See how to set up a notification system which does that in this episode.
如果你正在运行一个产品服务器，有一个好办法来记录所有发生的异常。在这个视频里教你怎样建立一个通知系统。

Have you ever wanted to access helper methods outside of the view layer? In this episode I show you a couple ways to do just that.
你是否想在视图外访问helper mothods？在这个视频里将告诉你怎么做。

If you need to create an advanced search with a lot of fields, it may not be ideal to use a GET request as I showed in episode 37. In this episode I will show you how to handle this by creating a Search resource.
当您需要建立一个有很多项的高级搜索，如果用视频#37用GET请求的方法可能不理想。在这个视频展示如何创建一个搜索资源来处理这一问题。

If you have a lot of logic associated with the data inside a session, you’ll need some central location to put this logic. See how to create a session based model in this episode.
如果在session里有很多相关逻辑的数据，您需要一些主要的位置来放置逻辑。这个视频教你如何基于model上建立session.