Rails - Sep 2006 - Newbie: Proper way to set default text_field form value ?

I''m using the _form.rhtml partial for both the new.rhtml  and
edit.rhtml
views like this:

<% if @product.cost %>
  <%= text_field ''product'', ''cost'', :size
=> 5 %>
<% else %>
  <%= text_field ''product'', ''cost'', :size
=> 5, :value => 0 %>
<% end %>

I couldn''t find a :defaultvalue or similar hash parameter and not sure 
how I''d add an "if not nil" statement to the form helper.

If there''s proper way to do this I''d be interested to learn.

Thanks,
DAN

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