Forum: Ruby on Rails 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!

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*