Django保留过滤器并将数据导出/下载到csv / xlsx

Question

我希望在模板中单击一个按钮，以将当前选定的记录导出到.csv文件。

这是我的部分模板，其中包括表单元素：

<form method="get">
    <p>{{ summary_filter.form }}
    <button type="submit">Search</button></p>

    <button type="submit" name="period" value="current_month" class="btn btn-sm btn-outline-secondary">
        Current Month
    </button>
    <button type="submit" name="period" value="last_month" class="btn btn-sm btn-outline-secondary">
        Last Month
    </button>
    <button type="submit" name="period" value="current_qtr" class="btn btn-sm btn-outline-secondary">
        Current Quarter
    </button>
    <button type="submit" name="period" value="last_qtr" class="btn btn-sm btn-outline-secondary">
        Last Quarter
    </button>
    <button type="submit" name="export_data" value="export_data" class="btn btn-sm btn-outline-secondary">
        Export messages
    </button>
</form>

这是我对特定页面的看法：

def summary(request):
  """ Summary page  - Displays summary of data by day in tables """
  all_messages = Message.objects.all()
  summary_filter = SummaryFilter(request.GET, queryset=all_messages)

  if request.GET:
    filter_messages = summary_filter.qs
    messages = data_filter(request.GET.get('period'), filter_messages)
  else:
    messages = data_filter("current_month", all_messages)

  df = pd.DataFrame.from_records(messages.values())
  if request.GET.get('export_data'):  
    filename = "message_export"
    sio = io.BytesIO()
    sheetname = "Messages"
    writer = pd.ExcelWriter(sio, engine='xlsxwriter')
    df.to_excel(writer, index=False, sheet_name=sheetname)
    writer.save()
    sio.seek(0)
    response = StreamingHttpResponse(sio, content_type='application/vnd.openxmlformats-officedocument.spreadsheetml.sheet')
    response['Content-Disposition'] = 'attachment; filename=%s.xlsx' % filename

    return response

例如，我通过单击current_qtr按钮过滤到“当前季度”。该页面显示已正确过滤。然后，我想单击“导出数据”按钮，保留当前季度（和其他可能的过滤器）并通过同一视图导出。