I wrote the article because a Google search for "updating rails" doesn't show any helpful results. With the urgent need to update to Rails 3.2.11 because of the recently announced security vulnerability, developers need to know what to do (especially part-time and hobby developers).
It focuses on Bundler and your Gemfiles so that people understand not only how to update rails, but their other gems too. Personally I don't like rvm gemsets for bundler controlled apps (like rails) and think that rvm, bundler, rubygems and so on only serve to confuse the same part-time and hobby developers.
