“collections.OrderedDict”对象没有属性“用户名”

Question

我有一个“事件”模型，它有一个带有默认用户模型的 many2many 字段。

class Event(models.Model):
    name = models.CharField(max_length=50)
    type = models.CharField(max_length=50)
    location = models.CharField(max_length=255)
    start_hour = models.CharField(max_length=50)
    end_hour = models.CharField(max_length=50)
    creator = models.CharField(max_length=50)
    info = models.CharField(max_length=255, default='')
    users = models.ManyToManyField(User)

    def __str__(self):
        return self.name

现在，我正在尝试更新此 many2many 字段，如下所示；

//my serializers

class UserSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = ('id',)


class EventSerializer(serializers.ModelSerializer):
    users = UserSerializer(many=True)

    class Meta:
        model = Event
        fields = ('id', 'users')

    def update(self, instance, validated_data):
        submitted_users = validated_data.get('users')
        if submitted_users:
            for user in submitted_users:
                user_instance = User.objects.get(id=user.id)
                instance.users.add(user_instance)
        instance.save()
        return instance

//views.py

class UpdateParticipants(generics.RetrieveUpdateDestroyAPIView):
    queryset = Event.objects.all()
    serializer_class = EventSerializer

但是，我收到如下图所示的错误

//这是我使用的APIView

Answer 1

你可以试试下面这段代码吗？

型号

示例

class UserModel(User):
    pass

class Event(models.Model):
    name = models.CharField(max_length=50)
    type = models.CharField(max_length=50)
    location = models.CharField(max_length=255)
    start_hour = models.CharField(max_length=50)
    end_hour = models.CharField(max_length=50)
    creator = models.CharField(max_length=50)
    info = models.CharField(max_length=255, default='')
    users = models.ManyToManyField(User, related_name='event_user') # Set related name to User object for Rest Framework

    def __str__(self):
        return self.name

序列化器

class EventSerializer(serializers.ModelSerializer):
    users = serializers.PrimaryKeyRelatedField(queryset=User.objects.all(), required=False)
    class Meta:
        model = Event
class Userserializer(serializers.ModelSerializer):
    event_user = EventSerializer(many=True)
    class Meta:
        model = UserModel

    def update(self, instance, validated_data):
        event_user = validated_data.pop('event_user', None)
        print (event_user)

        if validated_data:
            for attr, value in validated_data.items():
                if attr == 'password':
                    instance.set_password(value)
                else:
                    setattr(instance, attr, value)
            instance.save()
        return instance

观看次数

class EventView(APIView):
    permission_classes = (AllowAny,)

    def get(self):
        qv = User.objects.all()
        serializer = Userserializer(qv, many=True)
        return Response(data={'users': serializer.data}, status=status.HTTP_200_OK)

    def put(self, request, user_id):
        instance = Event.objects.get(user=user_id)
        serializer = Userserializer(instance=instance,data=request.data, partial=True)
        if serializer.is_valid(raise_exception=True):
            serializer.save()
            return Response(data={'users': serializer.data}, status=status.HTTP_200_OK)
        return Response(data={'users': serializer.errors}, status=status.HTTP_403_FORBIDDEN)  

网址-s

urlpatterns = [

    url(r'^users/(?P<user_id>\d+)',EventView.as_view())
]

JOSN 用于 put 的例子

JSON

{
    "id":1,
    "event_user":[{
        "name":"Changed Name"
    }]
}