Asset Pipeline

The asset pipeline allows you to write assets in languages like CoffeeScript, Sass, SCSS and LESS. It also handles asset packaging and fingerprinting.

Ruhoh leverages sprockets to manage the asset pipeline. If you are familiar with sprockets then using it in ruhoh is the same thing.


The asset pipeline is NOT enabled by default. This is to keep dependencies to a minimum.

In config.yml enable asset pipeline:

  enable: true


Be sure to load the sprockets gem and any necessary processing dependencies. The easiest way is to use bundler and update your Gemfile:

# Gemfile
gem 'sprockets', '~> 2.8'
gem 'sass'

Now run:

$ bundle update

Reload your web-server for changes to take effect.


Consult the sprockets readme for full documentation on how sprockets works.


In ruhoh, you'd load your stylesheets as normal:

<!DOCTYPE html>
<html lang="en">
    <meta charset="utf-8">
    <title>{{ page.title }}</title>
    <meta name="author" content="{{ }}">
    {{# stylesheets.load }}
    {{/ stylesheets.load }}

Only this time we see we load only one file application.css

We can use sprockets' directive processor to map our css dependencies for processing and packaging.

# application.css

//= require default
//= require style

These files will dynamically load whenever application.css is called. Note also how there is no need to specify file extensions.

  • twitter
    • javascripts
    • media
    • stylesheets
      • application.css
      • default.css.scss
      • style.css.scss

We can see above that both default.css.scss and style.css.scss are using SASS. Sprockets will automatically pre-process SASS and serve the resultant CSS in preview mode and for compiling.


If the asset pipeline is enabled ruhoh will automatically process and bundle all your assets as you've defined them in your file directives.

Ruhoh also supports filename finger-printing. As long as you use stylesheets.load and javascripts.load to load your assets, ruhoh will be able to update the filenames with the fingerprinted version.