“bin/rails: No such file or directory” w/ Ruby 2 & Rails 4 on Heroku

Question

While following the Rails 4 Beta version of Michael Hartl\'s Ruby on Rails Tutorial, my app fails to start on Heroku, but runs fine locally with

Answer 1

After struggling with this for a bit, I noticed that my Rails 4 project had a /bin directory, unlike some older Rails 3 projects I had cloned. /bin contains 3 files, bundle, rails, and rake, but these weren't making it to Heroku because I had bin in my global .gitignore file.

This is a pretty common ignore rule if you work with Git and other languages (Java, etc.), so to fix this:

1. Remove bin from ~/.gitignore
2. Run bundle install
3. Commit your changes with git add . and git commit -m "Add bin back"
4. Push your changes to Heroku with git push heroku master