ON THIS LINK

So that you can play along at home and test out the code samples in this article, we’ve created a simple web application, based on Ruby on Rails, that implements a RESTful web service. The first step is to download the web application named countries (.DMG, 600 KB). It is based on a simple, database of public domain data containing four fields: A country index, country name, gross domestic product, and two-character country abbreviation.