A dummy Rails app in which I demonstrate the use of several custom /app subdirectories: services, presenters, validators, and inputs.
bundle install
bundle exec rake db:setup
bundle exec rails server
You should check out the step by step progress of how I refactored things.
An easy way to do this in your local cloned repo is to git rebase -i c351757, change all pick to e, then git rebase --continue once for each commit.