当用户上传一个文档并点击提交时，该文件将被存储在一个文件夹中，并与一堆其他细节沿着创建一个数据库条目。我正在寻找的是，如果文档没有被上传到特定位置，则可以避免保存。
serializer.py

class DocumentSerializer(serializers.ModelSerializer):
    class Meta:
        model = Request
        fields = ['file', 'doc_type']

    def create(self, validated_data):
        msg = self.__construct_message_body()
        validated_data['type'] = Request.request_types[-1][0]
        validated_data['input_message'] = msg
        instance = ParseRequest.objects.create(**validated_data)
        msg['request_id'] = instance.id
        instance.input_message = msg
        instance.save()
        return instance

views.py

class DocumentView(CreateAPIView, ResponseViewMixin):
    parser_classes = (MultiPartParser, FileUploadParser,)
    serializer_class = DocumentSerializer

    def create(self, request, *args, **kwargs):
        try:
            data = request.data
            serializer = self.get_serializer(
                data=data, context={'request': request})
            serializer.is_valid()
            serializer.save()
        except Exception as e:
            logger.error(e)
            return self.error_response(message=ERROR_RESPONSE['UPLOAD_DOCUMENT'])
        return self.success_response(message=SUCCESS_RESPONSE['UPLOAD_DOCUMENT'])