Expat
This gem adds a mountable web application to your Rails app to allow editing of yml files. The files are saved in the same location, so your version control system will pick up the changes like normal.
Usage
After adding this gem to your Gemfile, add the following line in your
config/routes.rb:
mount(Expat::Engine => '/expat') if Rails.env.development?
Now restart your server and use the application at http://localhost:3000/expat