Rails' unobtrusive JavaScript not working

[kwltrs]

Unobtrusive JavaScript is not applied to HTML generated by helpers like link_to and button_to (see http://api.rubyonrails.org/classes/ActionView/Helpers/UrlHelper.html).
As a result, linking to restfull resources including HTTP verbs or adding confirm-dialogs to buttons, does not work.

Examples

Should send a DELETE request, but triggers a GET request:

link_to 'Do stuff', any_path(obj), :method => :delete

Should invoke a JavaScript confirm dialog, but the request is sent immediately:

button_to 'Do stuff', any_path(obj), :confirm =>  "Are you sure?"

This issue might relate to the upgrade to Rails 3.