From this point until the end of the tutorial, I recommend solving the exercises on a separate topic branch:

$ heroku create $ git push heroku master $ heroku run rake db:migrate

To install and include the new gems, we run bundle install.

Here the --skip-test-unit option to the rails command tells Rails not to generate a test directory associated with the default Test::Unit framework.

Full command Shortcut $ rails server $ rails s $ rails console $ rails c $ rails generate $ rails g $ bundle install $ bundle $ rake test $ rake Table 3.1: Some Rails shortcuts.