Rails - Feb 2009 - submit input to params

I have a form for a model, that has an auto-fill button based on
existing record. Basically you can choose if to duplicate an existing
record using a select list of the record already in the db.

This select list is inside the form for the new model, but I need to
somehow submit it in an independent manner from the rest of the form. I
was able to do this with observe_field, but I want to do it using a
button or link:

<% form_for @product, :url => { :action => ''create'' }
do -%>

<%= collection_select :product, :id, Product.find(:all), :id, :name %>
<%= link_to ''fill form'', :url => { :action =>
''fill_form'' } %>

# product fields

<% end %>


I''m having trouble catching the actual selection in the params[], and
I''d really appreciate help on this - thanks.
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I used link_to_remote with the :submit option pointing to the parent of 
the input I want to submit (doesn''t have to be a form!).

<% form_for ... do |f| %>
  <span id="inside_form">
    <%= collection_select ... %>
    <%= link_to_remote... :submit => ''inside_form'' %>
  </span>

  # rest of form fields
<% end %>

Hope this helps someone :)
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