Web Services on Rails by Kevin Marshall

By Kevin Marshall

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It's where you'll spend most of your development effort, so let's take a little extra time to explain everything that's going on here. The first line, web_service_api StatsApi, starts by associating the model with the StatsApi. Remember that only one API can be associated with a class, so every method in the model that we plan to expose through the web service must have a matching api_method definition in the StatsApi class. Next, apply some access control by calling before_invocation:checkusername, :except => [:listgames.

Yahoo offers a web service API for many of their services, including the popular Yahoo! search engine. The Yahoo! search service API is currently free, but it does limit the number of requests you can make (currently to 5,000 requests per IP address per day). To use the Yahoo API (and to test the sample code), you'll need a free Yahoo! Developer's Key. com/webservices/register_application. escape("SEARCH TEXT") # URL-encoded search value yahookey = "YOUR YAHOO DEVELOPER KEYs # Your Yahoo! com/" + # The URL to the Yahoo!

If you're building your web service clients in Ruby and implementing them as part of a Rails application, you are in luck. Building web service clients with Ruby on Rails requires only a few simple steps and involves just a few Ruby libraries. Even better news is that the majority of libraries you use for building clientsCGI, NET, REXML, Soap4r, XSD, and XML-RPCare automatically loaded by your Rails environment. All you have to worry about is knowing when, how, and where to use each library, and that's just what I'll help you figure out throughout the rest of this document.

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