The V in Rails’ MVC: templates and helpers

In a classic Rails application, we make the view layer from HTML templates. The framework introduces conventions for organizing templates that can be found if you take a look at an example project’s app/views folder. If we generated the User resource using the Rails scaffolding system (rails g resource user), we would see the following files:

app/  views/
    layouts/
      application.html.erb
    users/
      _form.html.erb
      _user.html.erb
      edit.html.erb
      index.html.erb
      new.html.erb
      show.html.erb

First, we have layouts—top-level templates that wrap endpoint-specific templates and contain metadata and other utility information required...