## views/questionaires/new


<%= error_messages_for :questionaire %>

<% form_for(@questionaire) do |f| %>

. . .


  <%= hidden_field_tag "time_started", Time.now %>

  <p>
    <%= f.submit "Create" %>
  </p>
<% end %>

## controllers/questionaires_controller.rb

  def create
    @questionaire = current_user.build_questionaire(params[:questionaire])
    @questionaire.time_taken = Time.now - params[:time_started]

    respond_to do |format|
      if @questionaire.save
        flash[:notice] = 'Questionaire was successfully created.'
        format.html { redirect_to( :controller => "account", :action => "logout") }
        format.xml  { render :xml => @questionaire, :status => :created, :location => @questionaire }
      else
        format.html { render :action => "new" }
        format.xml  { render :xml => @questionaire.errors, :status => :unprocessable_entity }
      end
    end
  end