[Rails] auto complete

I saw an example of the auto complete field sending a ajax request in
this format that allows a method in the controller to catch all auto
complete ajax requests:

'/rails/app/auto_complete_for/sample_origin'

but when I use it, the request is

'/rails/app/auto_complete_for_sample_origin'

My template says this

<%=text_field_with_auto_complete :sample, c, {:skip_style=>true}%>

How can I change it so that the request is '/rails/app/
auto_complete_for/sample_origin' ?

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