All source code in the Ruby on Rails Tutorial is available jointly under the MIT License and the Beerware License. See LICENSE.md for details.
To get started with the app, clone the repo and then install the needed gems:
$ bundle install --without production
Next, migrate the database:
$ rails db:migrate
Finally, run the test suite to verify that everything is working correctly:
$ rails test
If the test suite passes, you'll be ready to run the app in a local server:
$ rails server