Rails 3.1 and jquery-ui assets

Example of a working setup:

    $ cat app/assets/javascripts/application.js

    //= require jquery
    //= require jquery-ui


    $ cat app/assets/stylesheets/application.css

    /*
     *= require vendor
     *
     */


    $ cat vendor/assets/stylesheets/vendor.css

    /*
     *= require_tree ./jquery_ui 
     *
     */

    vendor/assets/ $ tree
     stylesheets
         vendor.css
             jquery_ui
                      jquery-ui-1.8.13.custom.css
                      ...
     images
        jquery_ui
            ui-bg_flat_0_aaaaaa_40x100.png
            ...

Finally run this command:

    vendor/assets/images $ ln -s jquery_ui/ images

Enjoy your jQuery UI