CSV link in Rails

gistfile1.txt

View:

#block
  %h3 Export
  %ul{:class=>"horizontal"}
    %li
      - if controller.action_name == 'show'
        = link_to "Open this Permit in Excel", permit_path(@item, :format => :csv)
      - if controller.action_name == 'index' 
        = link_to "Open the list of Permits in Excel", permits_path(:format => :csv)

Model:

  def to_csv
    [
      number,
      name,
      issued_date
    ].to_csv
  end

Controller:

    respond_to do |format|
      format.html # index.html.erb
      format.xml  { render :xml => @permits }
      format.csv  { 
        pcsv = @permits.collect { |p| "#{p.to_csv}" }.join 
        send_data  pcsv, :type => 'text/csv; charset=iso-8859-1; header=present',
          :disposition => "attachment; filename=Permits-#{Time.now.strftime('%m-%d-%Y')}.csv" }
    end