Topic: Multiple Rows of Data - Single Form - SINGLE MODEL

How can I create multiple records on a single form for a single model in Rails 3.0.3?  I am NOT using nested models, so the Railscast for nested models does not apply here.

_form.html.erb

<% form_for @invoice, :html => { :multipart => true } do |f| %>
   <%= f.error_messages %>
   
 
<table class="ExcelTable2007">
     <tr>     
     <th class="heading">PO #<font color="red"> *</font></th>
     <th class="heading">Invoice #<font color="red"> *</font></th>
     <th class="heading">"Bill To" is Correct</th>
     <th class="heading">Invoice Date<font color="red"> *</font></th>
     <th class="heading">Date Received<font color="red"> *</font></th>
     <th class="heading">AP Clerk Note<font color="red"> *</font></th>
     <th class="heading">Invoice Attachment<font color="red"> *</font></th>
   </tr>  
   <tr>     
     <td class="heading"><%= f.text_field :po_number, :size => 10 %></td>
     <td class="heading"><%= f.text_field :invoice_number, :size => 10 %></td>
     <td class="heading"><%= f.check_box :bill_to_address %></td>
     <td class="heading"><%= f.calendar_date_select "invoice_date", :time => false, :size => 12 %></td>
     <td class="heading"><%= f.calendar_date_select "date_received", :time => false, :size => 12 %></td>
     <td class="heading"><%= f.text_field :clerk_note %></td>
     <td class="heading"><%= f.file_field :attachment %></td>
    </tr>
  </p>
</table>

#######   ADD A NEW INVOICE RECORD BUTTON HERE #######
  <br>
  <br>
  
  <div class="actions">
    <%= f.submit "Submit" %>
  </div>
  </p>
<% end %>

invoices_controller.erb

  def create
    @invoice = Invoice.new(params[:invoice])
    d = @invoice.date_received
    respond_to do |format|
      if @invoice.save
  @invoice.update_attribute(:clerk_id, current_user.id)
  if @invoice.created_at > d + 2.days
    @invoice.update_attribute(:received_state_id, 3)
  else
          @invoice.update_attribute(:received_state_id, 1)
        end 
         format.html { redirect_to(ap_open_invoices_path) }
    flash.now[:notice] = "Invoice was successfully submitted."
        format.xml  { render :xml => @invoice, :status => :created, :location => @invoice }
    email_approver(invoice)
      else
        format.html { render :action => "new" }
        format.xml  { render :xml => @invoice.errors, :status => :unprocessable_entity }
      end
    end
  end