The tutorial linked below is quite nice. It shows the basics of using Nokogiri for data scraping, Sinatra to help create the web application, and Heroku for actually hosting the web application. A three-for-one deal.
http://hunterpowers.com/data-scraping-and-more-with-ruby-nokogiri-sinatra-and-heroku/
I'm so proud of my little copy of this blogger's tutorial.
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