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Asked: 2026-05-26T14:09:31+00:00

I’ve got a Rails 3.1 application. I generate a Controller, just to show what’s

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I’ve got a Rails 3.1 application. I generate a Controller, just to show what’s happening:

$ rails generate controller Rocks index show edit
      create  app/controllers/rocks_controller.rb
       route  get "rocks/edit"
       route  get "rocks/show"
       route  get "rocks/index"
      invoke  haml
      create    app/views/rocks
      create    app/views/rocks/index.html.haml
      create    app/views/rocks/show.html.haml
      create    app/views/rocks/edit.html.haml
      invoke  rspec
      create    spec/controllers/rocks_controller_spec.rb
      create    spec/views/rocks
      create    spec/views/rocks/index.html.haml_spec.rb
      create    spec/views/rocks/show.html.haml_spec.rb
      create    spec/views/rocks/edit.html.haml_spec.rb
      invoke  helper
      create    app/helpers/rocks_helper.rb
      invoke    rspec
      create      spec/helpers/rocks_helper_spec.rb
      invoke  assets
      invoke    coffee
      create      app/assets/javascripts/rocks.js.coffee
      invoke    scss
      create      app/assets/stylesheets/rocks.css.scss

Great. Looking good. Generated app/assets/stylesheets/rocks.css.scss. Just what I wanted.

Now, navigating to http://localhost:3000/rocks/index, I examine the source and see:

  <head> 
    ...
    <link href="/assets/application.css?body=1" media="screen" rel="stylesheet" type="text/css" /> 
    <script src="/assets/jquery.js?body=1" type="text/javascript"></script> 
    <script src="/assets/jquery_ujs.js?body=1" type="text/javascript"></script> 
    <script src="/assets/rocks.js?body=1" type="text/javascript"></script> 
    <script src="/assets/application.js?body=1" type="text/javascript"></script> 
    ...
  </head>

rocks.css is missing, and I have no idea why. Has anyone encountered something like this before?

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1 Answer

  1. Editorial Team

    Your application.css should have this lines:

    /*
 * This is a manifest file that'll automatically include all the stylesheets available in this directory
 * and any sub-directories. You're free to add application-wide styles to this file and they'll appear at
 * the top of the compiled file, but it's generally better to create a new file per style scope.
 *= require_self
 *= require_tree . 
*/

    the most important:

    *= require_tree .

    Then rocks.css should be included by the application.css, that’s an advantage using assets

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