Django Rest Framework-self.context没有请求属性

问题描述

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，并且 get_current_user 函数始终返回无。调试时，我发现self.context是空字典，即 {} 。可以肯定的是，我还打印了 self.context.keys（），但它仍然是空列表。

My api(which uses authentication_classes and permission_classes) is using this serializer and the get_current_user function always returns None. when I debug it, I found that self.context is empty dictionary, i.e {}. to be double sure I also printed self.context.keys(), still it's empty list.

我关注了

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

PS: I'm using 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)

推荐答案

如何在视图集的 list（）方法中创建序列化器？您应该致电

How do you create serializer in your viewset's list() method? You should call

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

可以自动填充序列化程序上下文，就像在。但是，我觉得您只是在手动创建它，就像这样：

to get your serializer context filled automatically as it is done in default implementation of this method in DRF mixins., but I have a feeling that you're just creating it manually, like this:

serializer = MyModelSerializer(instance)

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

So, to fix this, you should either call get_serializer(), or pass extra context argument to serializer constructor:

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

这篇关于Django Rest Framework-self.context没有请求属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！