Read this before deploying a new Rails app to Heroku!
Have you tried deploying a new Rails app to Heroku and gotten strange errors about rake, such as “Could not detect rake tasks”, or “cannot load such file – rake (LoadError)”? This is due to a recent change in Bundler. Read my guide about Understanding Gemfile.lock for the fix. This guide is for both beginners and experienced Rubyists who might not be aware of the Bundler issue.
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