Django查看html到pdf执行两次

Question

我有以下类来生成我使用的 pdf 文件 django-renderpdf从 html 模板生成 pdf。但是 View 执行了两次并抛出错误。
我的课:

class WeeklyMetre(PDFView):
    template_name = 'reports/invoice/weekly_metre.html'

    allow_force_html = True
    prompt_download = True

    @property
    def download_name(self) -> str:
        invoice = Invoice.objects.get(pk=self.kwargs['pk'])
        return f"WeeklyMetre_{invoice.invoice_number}.pdf"

    def get_context_data(self, *args, **kwargs):
        context = super().get_context_data(*args, **kwargs)
        invoice = Invoice.objects.get(pk=self.kwargs.get('pk'))
        market_labor_specifications = _getWeeklyMetreData(invoice=invoice)

        # calculate reported items: reported market_labor_specifications
        # invoiced specifications which are validated in invoice-period
        # but labor_date before invoice-period

        reported_mls = MarketLaborSpecification.objects.filter(invoice_id=self.kwargs.get('pk'), market_labor__labor_date__lt=invoice.period_from) \
        .values('market_labor__labor_date', 'specification__position', 'specification__name') \
        .order_by('market_labor__labor_date', 'specification__position', 'specification__name') \
        .annotate(sum_pos=Sum('validated_quantity'))

        context.update({
            'invoice': invoice,
            'market_labor_specifications': market_labor_specifications,
            'reported_mlss': reported_mls
        })

        print('context data', datetime.datetime.now())
        return context

在两次执行之间我有以下错误:

[01/Feb/2021 07:16:38] "GET /reports/invoice/select/17/ HTTP/1.1" 200 1414
context data 2021-02-01 07:16:44.835695
[01/Feb/2021 07:16:45] "GET /reports/weekly/metre/17/ HTTP/1.1" 200 58063
----------------------------------------
Exception happened during processing of request from ('127.0.0.1', 60114)
Traceback (most recent call last):
  File "/usr/lib/python3.6/socketserver.py", line 654, in process_request_thread
    self.finish_request(request, client_address)
  File "/usr/lib/python3.6/socketserver.py", line 364, in finish_request
    self.RequestHandlerClass(request, client_address, self)
  File "/usr/lib/python3.6/socketserver.py", line 724, in __init__
    self.handle()
  File "/home/t3tr4ktys/python-virtual-environments/BillOfQuantities/lib/python3.6/site-packages/django/core/servers/basehttp.py", line 174, in handle
    self.handle_one_request()
  File "/home/t3tr4ktys/python-virtual-environments/BillOfQuantities/lib/python3.6/site-packages/django/core/servers/basehttp.py", line 182, in handle_one_request
    self.raw_requestline = self.rfile.readline(65537)
  File "/usr/lib/python3.6/socket.py", line 586, in readinto
    return self._sock.recv_into(b)
ConnectionResetError: [Errno 104] Connection reset by peer
----------------------------------------
context data 2021-02-01 07:16:47.544189
[01/Feb/2021 07:16:48] "GET /reports/weekly/metre/17/ HTTP/1.1" 200 58063

首先，我不知道为什么它会被执行两次，而在第二次执行时，用户不再经过身份验证。最后，pdf 生成得很好，但我无法应用 LoginRequiredMixin。如果需要，将提供更多信息，并感谢您的帮助。

Answer 1

我相信我经历过这样的事情。
问题是当你调用你的端点时，你在 URL 中调用它，最后没有 '/' 导致 DRF 返回 301
将您重定向到相同的路径，但末尾带有“/”。问题在于，在重定向之后，您会丢失 header 和 cookie，从而变得未经身份验证。
这也解释了为什么您可以看到 2 个电话。
所以基本上如果你有这样的电话:

api/viewset/dosomethngs

到:

api/viewset/dosomethngs/