Question

我在序列化多对多关系后遇到此错误，这在没有URL的情况下工作正常但由于某种原因我在尝试包含它时遇到此错误。

`InitiativeUrlHyperlinkedIdentityField` requires the request in the serializer context. Add `context={'request': request}` when instantiating the serializer.

以下是我的观点和序列化程序。

Views.py

class CreateInitiativeAPIView(generics.CreateAPIView):
    serializer_class = CreateInitiativeSerializer

class InitiativeListAPIView(generics.ListAPIView):
    authentication_classes = [SessionAuthentication, BasicAuthentication, JSONWebTokenAuthentication]
    serializer_class = InitiativeListSerializer
    permission_classes = [permissions.IsAuthenticated]
    queryset = Initiative.objects.all()

class InitiativeDetailAPIView(generics.RetrieveAPIView):
    authentication_classes = [SessionAuthentication, BasicAuthentication, JSONWebTokenAuthentication]
    serializer_class = InitiativeFullSerializer
    permission_classes = [permissions.IsAuthenticated]
    lookup_field = 'id'


    def get_object(self):
        initiative_id = self.kwargs["initiative_id"]
        obj = get_object_or_404(Initiative, id=initiative_id)
        return obj

    def put(self, request, *args,**kwargs):
        return self.update(request, *args, **kwargs)

Serializers.py

class InitiativeUrlHyperlinkedIdentityField(serializers.HyperlinkedIdentityField):
    def get_url(self, obj, view_name, request, format):
        kwargs = {
            'initiative_id': obj.id,
        }
        return reverse(view_name, kwargs=kwargs, request=request, format=format)

class CreateInitiativeSerializer(serializers.ModelSerializer):
    class Meta:
        model = Initiative
        fields = ['name', 'description', 'image', 'goal']

class InitiativeListSerializer(serializers.ModelSerializer):
    url = InitiativeUrlHyperlinkedIdentityField("initiative_detail_api", lookup_field='id')
    class Meta:
        model = Initiative
        fields = [
            'url',
            'name',
        ]

class InitiativeFullSerializer(serializers.ModelSerializer):
    url = InitiativeUrlHyperlinkedIdentityField("initiative_detail_api", lookup_field='id')
    class Meta:
        model = Initiative
        fields = [
            'url',
            'id',
            'name',
            'description',
            'image',
            'goal']

这是从InitiativeFullSerializer获取信息的序列化程序。

class ChapterInitiativePartialListSerializer(serializers.ModelSerializer):
initiative = InitiativeFullSerializer(many=False, read_only=True)
class Meta:
    model = ChapterInitiative
    fields = [
        'initiative'
    ]

通过URL调用的初始序列化程序。

class ChapterFullListSerializer(serializers.ModelSerializer):
url = ChapterUrlHyperlinkedIdentityField("chapter_detail_api", lookup_field='id')
active_initiativeset = serializers.SerializerMethodField('get_active')
school = serializers.CharField(source='school.name', read_only=True)
class Meta:
    model = Chapter
    fields = [
        'url',
        'id',
        'school',
        'name',
        'payee',
        'active_initiativeset'
    ]

def get_active(self, chapter):
    initiatives = chapter.chapterinitiative_set.filter(active=True)
    serializer = ChapterInitiativePartialListSerializer(instance=initiatives, many=True)
    return serializer.data

我的代码中应该添加context={'request': request}？

Answer 1

嗯。你必须检查你的视图类。有一个名为get_serializer_context()的方法，默认情况下应该添加请求。见here。我会先检查一下。

Django Rest框架HyperlinkedIdentityField错误（需要请求）

1 个答案: