I'm trying to get into Ruby on Rails at the moment, and sometimes it's pretty hard to find the little pieces of information you need. Primarily, I just wanted to parse a xml feed. There are multiple ways, but I don't want to get too much into detail at that point. Whatever you like, hpricot, libxml or other parsers, they have to be included in order to work. 

As for me, I just found Ruby examples, but the integration in Rails is quite a bit different. So instead of include a library, open your gemfile in the root of your ruby on rails project and add gem 'hpricot' (if you're using hpricot). This is all and you're ready to go!

Hope I could save you some time googling for this. Happy developing!

(Image credit goes to Chuck “Caveman” Coker)