Question

我需要在request.user函数中访问to_representation，我尝试过self.context['request']，但是self.context是空字典。是否有访问request.user的方式，或者可以将数据推送到此功能的任何方式？

def to_representation(self, obj):
    print(self.context)

#output is an empty dictionary {}

更新

class RetrieveView(generics.RetrieveAPIView):
    def get(self, request, *args, **kwargs):
        uid = kwargs.get('uid')
        try:
            item = self.model.nodes.get(uid=uid)
        except Exception as e:
            # error response
        serializer = self.serializer_class(item)
        return HttpSuccessResponse(SuccessResponse(serializer.data).to_json(), status=status.HTTP_200_OK).send()


class TopicRetrieveView(single_result.RetrieveView):
    model = Topic
    serializer_class = topic.TopicSerializer

Answer 1

所有编码均来自django rest框架通用视图generic.py

serializer_class是我们在类定义中设置的属性，或者我们需要覆盖get_serializer_class函数。它将在此功能中处理：

def get_serializer_class(self):
    """
    Return the class to use for the serializer.
    Defaults to using `self.serializer_class`.

    You may want to override this if you need to provide different
    serializations depending on the incoming request.

    (Eg. admins get full serialization, others get basic serialization)
    """
    assert self.serializer_class is not None, (
        "'%s' should either include a `serializer_class` attribute, "
        "or override the `get_serializer_class()` method."
        % self.__class__.__name__
    )

    return self.serializer_class

get_serializer_class将在get_serializer函数中使用：

def get_serializer(self, *args, **kwargs):
    """
    Return the serializer instance that should be used for validating and
    deserializing input, and for serializing output.
    """
    serializer_class = self.get_serializer_class()
    kwargs['context'] = self.get_serializer_context()
    return serializer_class(*args, **kwargs)

和context将由get_serializer_context函数填充。

def get_serializer_context(self):
    """
    Extra context provided to the serializer class.
    """
    return {
        'request': self.request,
        'format': self.format_kwarg,
        'view': self
    }

因此正确的用法是serializer = self.get_serializer(item)，因为它将使用serializer_class来序列化项目，并用可能有用的额外信息填充context。 serializer = self.serializer_class(item)可以仅用于序列化项目而无需更多信息。

如何在Django中获取请求用户数据休息到表示功能

1 个答案: