Rails - Dec 2007 - Parameter being stripped form Search form with Restful Routes

I am having trouble with a search form and restful routes.

In my app I have a Topic model and a Classroom model.  Topics can
exist in classrooms but don''t have to so for that reason I have not
nested them.

I want to have a form that passes a topic_id and the search
parameter.  So I have a form that looks like this:

<% form_tag ({:action => "show", :topic_id => @topic.id, :id
=>
@classroom.id} , {:method => ''get''}) do %>
<p>
	<%= text_field_tag :search, params[:search] %>
	<%= submit_tag "Search", :name => nil %>
</p>
<% end %>

But when I submit the form the search param is posted but the topic_id
param is stripped.  So when searching for ''gen'' I get:

/classrooms/1?search=gen

instead of:

classrooms/1?search=gen&topic_id=43

The strange thing is that if I embed this in a link_to (setting the
additional param :search to a fixed value) the topic_id param doesn''t
get stripped.  It is only when it is submitted via the form that the
topic_id parameter is stripped.

Any ideas?

Thanks


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