Latest Screencasts (page 25)

Active Merchant is a great library for handling credit card transactions. In this episode I will show you the basics of using it to communicate with PayPal's gateway.

This episode shows how to encrypt the variables passed to PayPal and verify the authenticity of the payment notifications (IPN).

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.

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Metaprogramming lets you program more expressively. This makes your code easier to write and easier to maintain and extend. Learn both the hows and whys of metaprogramming Ruby from Dave Thomas, one of the most experienced Ruby programmers in the western world.

The classic Gnu Emacs text editor is an incredibly powerful piece of software that has been used by thousands of programmers over the last few decades. Many alpha geeks have recently been giving Emacs a second look as well. Emacs Lisp expert Phil Hagelberg prepared the script and accompanying code...

This episode is the first in a series on handling the checkout process for orders. Here we show how to complete purchases through PayPal's Website Payments Standard service.

Many prominent Rails developers have jumped on the BDD bandwagon, and with good reason! It’s a great workflow and values clarity, small steps, database-independence, and self-documenting code. If Test::Unit doesn’t make sense to you, or if you want to write better code, this is the place to start. This 55...

Internationalization is one of the biggest additions in Rails 2.2. See how the basics work in this episode.

How do you use jQuery with Rails? In this episode I redo episode #43 using jQuery instead of Prototype/RJS.

Learn how to write faster Ruby applications and gain a deeper understanding of what it takes to scale Ruby. Topics covered: processes & threads, green vs native threading, eventmachine, process messaging, dropping to c, learning ruby-prof, speeding up ruby code.