Question

经过大量调试约4-5小时。我放弃了试图找到导致这个问题的原因，可能是非常简单的bug。通过Update和Patch / Put Mixins尝试了这一点，并且也没有用。由于查询集，它是100％，但我找不到问题？尝试使用.get（）和我能想到的其他一切。

我的观点非常简单：

class RemoveModel3D(generics.DestroyAPIView):

    serializer_class = Model3DSerializer

    def get_queryset(self):
        user_pk = self.kwargs["pk"]
        return Model3D.objects.filter(owners__in=[user_pk])

P.S。该查询集与ListModelMixin完美配合。我读到List是针对集合而Retrieve / Destroy / Update是针对单个模型实例的，但是如何让queryset成为单个模型实例？我找不到任何地方

编辑：添加与问题相关的序列化程序和模型片段

序列化程序：

class Model3DSerializer(serializers.ModelSerializer):

    User = get_user_model()

    commits = CommitSerializer(many=True, required=False, read_only=True)
    favorited_by = UserSerializer(many=True, required=False, read_only=True)

    date_uploaded = serializers.DateTimeField(read_only=True)
    owners = serializers.PrimaryKeyRelatedField(many=True, read_only=True)

    class Meta:
        model = Model3D
        fields = (
            'id',
            'title',
            'owners',
            'description',
            'date_uploaded',
            'favorited_by',
            'commits'
        )

型号：

class Model3D(models.Model):

    title = models.CharField(max_length=64)
    # Many models many owners, seems reasonable to me
    owners = models.ManyToManyField(User, related_name='owners')
    description = models.TextField(null=True)
    date_uploaded = models.DateTimeField(auto_now_add=True)

    # Many models many people who like them.
    favorited_by = models.ManyToManyField(User, related_name='favorited_by')

查看：

class ListAllModels3D(generics.ListAPIView):

    serializer_class = Model3DSerializer

    def get_queryset(self):
        queryset = Model3D.objects.all()
        model_id = self.request.query_params.get('id', None)

        if model_id is not None:
            queryset = queryset.filter(pk=model_id)

        return queryset

class RemoveModel3D(generics.DestroyAPIView):

    serializer_class = Model3DSerializer

    def get_queryset(self):
        queryset = Model3D.objects.all()
        model_id = self.request.query_params.get('id', None)

        if model_id is not None:
            queryset = queryset.filter(pk=model_id)

        return queryset


class Models3D( mixins.ListModelMixin,
            mixins.CreateModelMixin,
            generics.GenericAPIView,
        ):

    serializer_class = Model3DSerializer

    def get_queryset(self):
        user_pk = self.kwargs["pk"]
        return Model3D.objects.filter(owners__in=[user_pk])

    def get(self, request, *args, **kwargs):
        return self.list(request, *args, **kwargs)

    def post(self, request, *args, **kwargs):
        return self.create(request, *args, **kwargs)

    def perform_create(self, serializer):
        # FIXME: this is a bad way to set the value, but ...
        user_id = self.kwargs["pk"]
        serializer.validated_data['owners'] = [user_id]

        serializer.save()

Answer 1

当404提高？（在你的情况下）
假设您需要使用Model3D编辑/删除/检索id=20实例。在这种情况下，您的终端将为/api/v1/model3d/20/，方法将为DELETE/PUT/PATCH/GET。此时DRF使用Model3D搜索id = 20个实例。如果找到，它将执行相应的操作，否则会引发404 NotFound错误。

如果您正在处理CRUD申请，ModelViewSet最适合您。默认情况下，它会处理大部分内容，只需几行代码。

from rest_framework.viewsets import ModelViewSet


class Model3DAPI(ModelViewSet):
    serializer_class = Model3DSerializer
    queryset = Model3D.objects.all()

这会为你做CRUD。如果您希望对每个CRUD操作需要更多控制，可以按以下方式覆盖它们，

from rest_framework.viewsets import ModelViewSet


class Model3DAPI(ModelViewSet):
    serializer_class = Model3DSerializer
    queryset = Model3D.objects.all()

    def retrieve(self, request, *args, **kwargs):
        # get one instance
        pass

    def destroy(self, request, *args, **kwargs):
        # delete instance
        pass

    def list(self, request, *args, **kwargs):
        # list all instnace
        pass

    def create(self, request, *args, **kwargs):
        # create instance
        pass

    def update(self, request, *args, **kwargs):
        # Update instance
        pass

Answer 2

GenericApiView的默认lookup_url_kwarg为pk。但是您使用它来过滤User，因此在查询所有者和Model3D时将使用相同的pk值。

结果与此伪代码类似，除非用户和model3d具有相同的pk，否则会导致404响应。

kwargs = {'pk': 20} 
try:
   Model3D.objects.get(owners__in=[kwarsg['pk']], pk=kwargs['pk'])
except ObjectNotFound:
   raise Http404Exception('Not found')

要解决此问题，请使用支持嵌套api路由的插件。或者您可以覆盖视图集get_object方法，这是404引发的方法。

def get_object(self):
    queryset = self.get_queryset()
    pk = self.request.query_params.get('id', None)
    obj = get_object_or_404(queryset, pk=pk)
    self.check_object_permissions(self.request, obj)
    return obj

http://www.django-rest-framework.org/api-guide/generic-views/#get_objectself

get_object（GET）retrieve() PATCH / PUT和update()（DELETE）使用destroy()方法，默认使用self.kwargs['pk']查找值。

Django - DRF删除/检索/补丁返回404 {详细信息：＆＃34;未找到＆＃34; }

2 个答案: