How can I choose Ruby version on Heroku?

Question

I use Ruby 1.9.x syntax in my Rails 3 app, but after pushing it to Heroku it crashes due to older Ruby version (1.8). How can I control it?

Answer 1

I wanted to use the version I already had defined in the .ruby-version file so I ended up creating a buildpack that can be used before heroku-buildpack-ruby that injects the version from the .ruby-version into the Gemfile. It also support versions without patch or aliases.

https://github.com/platanus/heroku-buildpack-ruby-version

This way you can have your version defined only in one place.