How to add confirm message with link_to Ruby on rails

I might be mistaken but you don’t specify a controller along with the :action option. Have you tried the following? Assuming you have a messages resource configured in your route:

link_to 'Reset', message_path(@message), :confirm => 'Are you sure?'

EDIT: Above is deprecated. Rails 4.0 now accepts the prompt as a data attribute. See the doc here (Thanks @Ricky).

link_to 'Reset', message_path(@message), :data => {:confirm => 'Are you sure?'}