strain, 寫成這樣好醜 XD

        if params[:type]
          SmsRecord.sys
        else
          SmsRecord.purchase
        end.find(:all, :conditions => cond).each do |row|
          csv << [row.id, row.sms_purchase_record_id, row.user_id, row.send_to_sms_at.strftime('%Y/%m/%d %H:%M'), row.sms_rsp_code]
        end