'collections.OrderedDict'对象没有属性'pk'-Django Rest Framework [英] 'collections.OrderedDict' object has no attribute 'pk' - django rest framework

问题描述

我有一个模型，我想为其编写一个 update()方法以进行更新.以下代码段是我的模型:

I have a model and I want to write an update() method for it in order to update. The below snippet is my model:

class Klass(models.Model):
    title = models.CharField(max_length=50)
    description = models.CharField(max_length=500)
    university = models.CharField(max_length=50,blank=True, null=True)
    teacher = models.ForeignKey(Profile, related_name='teacher', on_delete=models.CASCADE)

，下面的代码段对应于 Serializer :

and the below snippet is corresponding Serializer:

class KlassSerializer(ModelSerializer):
        teacher = ProfileSerializer()
        url = HyperlinkedIdentityField(view_name='mainp-api:detail', lookup_field='pk')
        klass_settings = KlassSettingsSerializer()

    class Meta:
        model = Klass
        fields = ('url', 'id', 'title', 'description', 'university','teacher')

    
    def update(self, instance, validated_data):
        instance.title = validated_data.get('title', instance.title)
        instance.description = validated_data.get('description', instance.description)
        instance.university = validated_data.get('university', instance.university)
        instance.save()

        return instance

为了更新，我使用以下代码段:

And for update, I use below snippet:

class KlassAPIView(APIView):    
    def put(self, request, pk=None):
        if pk == None:
            return Response({'message': 'You must specify class ID'}, status=HTTP_400_BAD_REQUEST)

        klass = Klass.objects.get(pk=pk)
        if request.user.profile.type != 't':
            raise PermissionDenied(detail={'message': 'You aren't teacher of this class, so you can't edit information.'})

        serializer = KlassSerializer(data=request.data, context={'request': request})
        serializer.initial_data['teacher'] = request.user.profile.__dict__

        if serializer.is_valid():
            serializer.update(instance=klass, validated_data=serializer.data)  # Retrieve teacher and store
            return Response({'data': serializer.data}, status=HTTP_200_OK)
        else:
            return Response({'data': serializer.errors}, status=HTTP_400_BAD_REQUEST)

但是当我使用 PUT 方法发送数据时，它返回以下错误:

but when I send data with PUT method, it returns below error:

/api/class/49/

AttributeError at /api/class/49/

AttributeError

'collections.OrderedDict'对象没有属性'pk'

'collections.OrderedDict' object has no attribute 'pk'

并且错误发生在 serializer.update(instance = klass，validated_data = serializer.data)行中.

推荐答案

只是遇到了相同的错误.

Just ran into the same error.

在我的情况下，问题是我在执行 serializer.save()之前访问了 serializer.data .

In my case the problem was I accessed serializer.data before doing serializer.save().

Google将我放在这里，所以也许其他人也会对此有所帮助.

Google dropped me here, so maybe someone else will also find this helpful.

来源: https://github.com/encode/django-rest-framework/issues/2964

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