dce/asset_pipeline.md

## asset_pipeline.md

      
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              asset_pipeline.md
            
          
    Rails 3.1 Asset Pipeline


The new asset pipeline in Rails 3.1 makes assets first class citizens in Rails
Assets now in app/assets rather than public (also lib/assets, vendor/assets)
Asset files can inline other asset files using requires
Asset packages are defined in manifests

/*
 *= require blueprint/reset
 *= require blueprint/typography
 */


Gem dependencies can provide asset files for the application to use
In production mode, generated files include an MD5 hash as part of the file name
At the heart of the pipeline is Sprockets 2.0
Sprockets will allow any number of filters to be used with asset files

run a file through SASS and ERB by naming it stylesheet.css.scss.erb


body {
  background: url(<%= asset_path "sunshine-rainbows-and-lollipops.png" %>);
  /* You have to use ERB to link to asset pipelined resource */
}


CoffeeScript and SASS are now included in the default template

Invoke w/ application.js.coffee, application.css.sass


support for JS minification comes built-in with Rails via UglifyJS

http://guides.rubyonrails.org/asset_pipeline.html

https://github.com/sstephenson/sprockets

http://blog.nodeta.com/2011/06/14/rails-3-1-asset-pipeline-in-the-real-world/