Bundler

After creating a new Rails application, the next step is to use Bundler to install and include the gems needed by the app. As noted briefly in Section 1.2.3, Bundler is run automatically (via bundle install) by the rails command, but in this section we’ll make some changes to the default application gems and run Bundler again. This involves opening the Gemfile with your favorite text editor:

The result should look something like Listing 1.4. The code in this file is Ruby, but don’t worry at this point about the syntax; Chapter 4 will cover Ruby in more depth.