CSV書き出し
report = '' CSV::Writer.generate(report, ',') do |csv| csv << ["ログイン名 ", "パスワード"] User.find_all.each do |model| csv << [model.login, model.password] end end send_data(NKF.nkf('-U -s -Lw', report), :type => 'text/csv; charset=shift_jis; header=present', :filename => "report-#{Time.now.strftime('%Y%m%d-%H%M%S')}.csv")