Rails - Nov 2012 - undefined method `original_filename' for nil:NilClass

Hi, although I saw this problem in other blogs, I couldn''t make it
works.
My view:
*<%= semantic_form_for :routes_status_race, :url => 
status_race_admin_routes_path do |f| %>*
* <% contact_array = Contact.all.map {|contact| [contact.name, 
contact.id]}%>*
*  <% route_importer_array = RouteImporter.all.map {|importer| 
[importer.name, importer.id]}%>*
*  <%= f.inputs do%>*
*  <%= f.input :contact, :as => :select, :collection => Contact.all
%>*
*  <%= f.input :route_import, :as => :select, :collection => 
RouteImporter.all %>*
*        <%= f.input :uploaded_data, :action => :status_race, :multipart
=>
true, :as => :file %>*
*  <%end%>*
*  <input name=''commit'' type=''submit''
method=''post'' value=''Import''/>*
*<%end%>*

My controller:

 *collection_action :status_race, :method => :post do*
*
*
*    uploaded_io = params[:uploaded_data].original_filename*
*
*
*    File.open(Rails.root.join(''app/importers'',
''uploads'',
uploaded_io.original_filename), ''w'') do |file|*
*      file.write(uploaded_io.read)*
*    end*
*
*
*    RoutesQuickcom.new.run(uploaded_io.original_filename)*
*    render "status_race"*
*  end*
*end*

I don''t know how to fix it , any help will be appreciate, thanks!

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Now is solved, just in case that somebody will has the same problem, here 
is the solution, the view was right, I just change the controller part:

*collection_action :status_race, :method => :post do*
*
*
*    uploaded_io = params[:routes_status_race][:uploaded_data]*
*
*
*    File.open(Rails.root.join(''app/importers'',
''uploads'',
uploaded_io.original_filename), ''w'') do |file|*
*      file.write(uploaded_io.read)*
*    end*
*    RoutesQuickcom.new()*
*    render "status_race"*
*  end*

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