cdn_assets 
Easily include popular CDN assets (e.g. jQuery, Twitter Bootstrap, Font Awesome, etc.) in your Ruby on Rails application.
This gem can definitely be used as a long-term solution if you're okay with the risks associated with having your assets served by a third party, but it's probably much more suited to those times when you just need to put something together quickly without hassle.
Installation
Add this line to your application's Gemfile:
gem 'cdn_assets'And then execute:
$ bundle installUsage
Anywhere in a view file (e.g. the <head> of application.html.erb), use the cdn_asset function to include a single CDN asset. Example:
cdn_asset :jquery, v: '1.10.1', c: :googleWhich produces the following output:
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>As can be seen, the first argument to the function is the asset name, and the second is a hash of options containing the version (v) and the CDN (c) to serve it from. The options hash can also contain anything you would normally pass as options to a javascript_include_tag or a stylesheet_link_tag.
You can call the function as many times as you want, but if you want to include multiple assets in the same view, then a better way is to pass a hash to the cdn_assets (plural) function. Example:
cdn_assets bootstrap: { v: '2.3.2', c: :cdnjs }, font_awesome: { v: '3.2.1', c: :netdna }Supported Assets & CDNs
Below is a matrix showing the assets and CDNs currently supported by this gem, ordered alphabetically. Use the exact names listed here as symbols or strings in your code.
| cdnjs | jsdelivr | microsoft | netdna | ||
|---|---|---|---|---|---|
| bootstrap | 👍 | 👍 | |||
| bootstrap_combined | 👍 | ||||
| bootstrap_js | 👍 | 👍 | 👍 | ||
| bootstrap_responsive | 👍 | 👍 | |||
| font_awesome | 👍 | 👍 | 👍 | ||
| jquery | 👍 | 👍 | 👍 | 👍 |