You may resubmit a previous presentation to the conference.

<% form_for :submission, :url => {:action => 'create'} do |f| %> <%= f.error_messages %> <%= f.select "presentation_id" ,@presentations.collect {|p| [ p.name, p.id ] } %> <%= f.hidden_field :conference_id %>

<%= f.submit "Submit presentation"%> <% end %>