Question

class MyModelSerializer(serializers.ModelSerializer):
    field1 = serializers.CharField()
    field2 = serializers.SerializerMethodField('get_awesome_user')

    def get_current_user(self):
        request = self.context.get("request")
        if request and hasattr(request, "user"):
            return request.user
        return None

   def get_awesome_user(self, obj):
       user = self.get_current_user()
       ## use this user object, do some stuff and return the value
       return ...

我的api（使用authentication_classes和permission_classes）正在使用此序列化程序，get_current_user函数始终返回None。当我调试它时，我发现self.context是空字典，即{}。要确保我还打印了self.context.keys()，还是它的空列表。

我跟着这个帖子。

Get current user in Model Serializer

PS：我正在使用djangorestframework==3.3.3，Django==1.9.1

编辑：添加视图集代码

class MyModelViewSet(viewsets.ModelViewSet):

    authentication_classes = (SessionAuthentication, BasicAuthentication, TokenAuthentication)
    permission_classes = (IsAuthenticated,)

    def list(self, *args, **kwargs):
         queryset = MyModel.objects.all()
         page = self.paginate_queryset(queryset)
         if page is not None:
             serializer = MyModelSerializer(page, many=True)
             return self.get_paginated_response(serializer.data)

         serializer = MyModelSerializer(queryset, many=True)
         return Response(serializer.data)

Answer 1

如何在视图集的list()方法中创建序列化程序？你应该打电话给

serializer = self.get_serializer(data=request.data)

在default implementation of this method in DRF mixins中完成后自动填充序列化程序上下文。但我觉得你只是手动创建它，如下所示：

serializer = MyModelSerializer(instance)

因此，要解决此问题，您应该调用get_serializer()，或者将额外的上下文参数传递给序列化器构造函数：

serializer = MyModelSerializer(instance, context={'request': request, ...})

Answer 2

我们可以在序列化程序中使用self._context来访问request和view。

class MyModelSerializer(serializers.ModelSerializer):
    field1 = serializers.CharField()
    field2 = serializers.SerializerMethodField('get_current_user')

    def get_current_user(self):
        request = self._context.get("request")
        if request and hasattr(request, "user"):
            return request.user
        return None

Django rest框架 - self.context没有请求属性

2 个答案: