更新Django表中的字段不起作用

Question

当前，我正在尝试使用ajax post方法更新表中的某些字段，如果ajax [data]！='None'，则给出了一个条件，然后更新了一个字段。仅当条件有一个语句（如果我通过另一个语句）时，它才起作用，它仅更新该字段，而不是更新查询中提到的所有内容。

def outwardmailupdateMaker(request):
    datetime = 'None'
    if request.is_ajax() and request.method == "POST":
        out_id = request.POST['out_id']
        senders_details = request.POST['senders_details']
        mail_particulars = request.POST['mail_particulars']
        address = request.POST['address']
        sender_remarks = request.POST['remarks']
        pod_number = request.POST['pod_number']
        if pod_number != 'None':
            bm_pod_confirmation = 'Updated'
        else:
            bm_pod_confirmation = 'Pending'
        OutwardMailTable.objects.filter(pk=out_id).update(senders_details=senders_details,
                                                          mail_particulars=mail_particulars,
                                                          address=address,
                                                          sender_remarks=sender_remarks,
                                                          pod_number=pod_number,
                                                          bm_pod_confirmation=bm_pod_confirmation)

    return HttpResponse("test")

这将更新传递给update方法的所有字段，但是下面仅在pod_number！='None'

时更新pod_uploaded_date字段。

def outwardmailupdateMaker(request):
    datetime = 'None'
    if request.is_ajax() and request.method == "POST":
        out_id = request.POST['out_id']
        senders_details = request.POST['senders_details']
        mail_particulars = request.POST['mail_particulars']
        address = request.POST['address']
        sender_remarks = request.POST['remarks']
        pod_number = request.POST['pod_number']
        if pod_number != 'None':
            bm_pod_confirmation = 'Updated'
            pod_uploaded_date = now
        else:
            bm_pod_confirmation = 'Pending'
        OutwardMailTable.objects.filter(pk=out_id).update(senders_details=senders_details,
                                                          mail_particulars=mail_particulars,
                                                          address=address,
                                                          sender_remarks=sender_remarks,
                                                          pod_number=pod_number,
                                                          pod_uploaded_date=pod_uploaded_date,                                                        
                                                        bm_pod_confirmation=bm_pod_confirmation)

    return HttpResponse("test")