Fallback Asset Gem

Create fallbacks to your assets. Helpful to work with development and cdn assets.

Installation

In your Gemfile:

gem 'fallback_assets'

Features

Add assets (javascripts / stylesheets) to your codebase with fallback to local files
Great to use with CDN assets (first idea)
The local asset will be used if the CDN is not available
Easy to config

How to use

Single use

= fallback_javascript :underscore
= fallback_stylesheet :normalize

Configuration

Create a file config/fallback_assets.yml under your rails app.

fallbacks:
  stylesheets:
    normalize:
      production: //cdn/normalize.min.css
      development: /assets/normalize.css
      test: /assets/normalize.css

  javascripts:
    jquery:
      production: //cdn/jquery.min.js
      development: /assets/jquery.js
      test: /assets/jquery.js

Tips-for-Troubleshooting

If you are expecting errors while your tests are running, set the test environment like this:

...
underscore:
  development: /assets/underscore.js
  production: //whatevercdn/underscore.min.js
  test: /assets/underscore.js # this is important, to access a file from vendor/assets/javascripts, use: /assets

fallback_assets

Development