Rails - Oct 2007 - validate_presence_of radio button selected?

Hi,

I''m trying to force a user to pick one of several options, but
validate_presence_of doesn''t seem to work on my radio buttons.  Has
anyone else had this problem?

##Model
validates_presence_of :category_id

##View

<% category_list.each do |cat| %>
     <%= radio_button (:video, :category_id, cat.id) %>
     <label class="radio" for="band_category_id_<%= cat.id
%>">
         <%= cat.name %>
     </label>
     <br />
<% end %>
-- 
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