我正在尝试使用Django Restful Framework中的Filter使用django_filters。我想使用两个字段，因此这两个字段都必须满足条件。这意味着用户必须输入ref_code和expecting_time。但是现在，如果用户输入ref_code，查询仍然有效。最后，如果查询为空，我需要一个自定义的消息。
filters.py

import django_filters
from myappointment.models import *

class AppointmentFilter(django_filters.FilterSet):
    
    class Meta:
        model = AppointmentData
        fields =['ref_code', 'expecting_time']

api.py

@api_view(['GET'])
def AllAppointmentData(request):
    queryset = AppointmentData.objects.all()
    filterset = AppointmentFilter(request.GET, queryset=queryset)

    if filterset.is_valid():
        queryset = filterset.qs
        if queryset is not None:
            serializer = AppointmentDataSerializer(queryset, many=True)
            return Response(serializer.data)
        else:
            return Response([], {'success': "The Query is empty"}, status=status.HTTP_200_BAD_REQUEST )

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