This version lets you specify a Ruby version (such as “1.9.3”) as well as a Ruby engine (such as “jruby”) in your Gemfile. Specifying a Ruby version is required if you plan to deploy to Heroku. It also helps rvm switch to the right Ruby version. And it prevents people from running your code with the wrong version of Ruby.
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I’ve updated two of my articles to point out the need to update Bundler:
Installing Rails Rails on Heroku
To summarize:
This version lets you specify a Ruby version (such as “1.9.3”) as well as a Ruby engine (such as “jruby”) in your Gemfile. Specifying a Ruby version is required if you plan to deploy to Heroku. It also helps rvm switch to the right Ruby version. And it prevents people from running your code with the wrong version of Ruby.
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