Django Rest Framework錯誤無法在未設置`.queryset`或沒有`.get_queryset（）`方法的視圖上應用DjangoModelPermissions

Question

我正在使用django 1.9.5和rest框架3.x（DRF）。我剛從django rest官方框架學習了教程，可以說它是從DRF開始的，我已經寫了以下視圖 ， URL以查看api的工作原理使用DRF，

意見

class DepartMentList(APIView):
    """
    List of all departments or create a department
    """

    def get(self, request, format=None):
        departments = Department.objects.all()
        serializer = DepartmentSerializer(departments)
        return Response(serializer.data)

    def post(self, request, format=None):
        serializer = DepartmentSerializer(data=request.data)

        if serializer.is_valid():
            serializer.save()
            return   Response(serializer.data,status=status.HTTP_201_CREATED)
        return Response(serializer._errors, status=status.HTTP_400_BAD_REQUEST)

網址

from django.conf.urls import url

from rest_framework.urlpatterns import format_suffix_patterns

from organizations import views

    urlpatterns = [
        url(r'^departments/$', views.DepartMentList.as_view()),
    ]

    urlpatterns = format_suffix_patterns(urlpatterns)

這是setting.py，在其中我為DEFAULT_PERMISSION_CLASSES添加了以下rest framework字典

REST_FRAMEWORK = {
# Use Django's standard `django.contrib.auth` permissions,
# or allow read-only access for unauthenticated users.
'DEFAULT_PERMISSION_CLASSES': [
    'rest_framework.permissions.DjangoModelPermissionsOrAnonReadOnly'
]

}

現在，當我運行部門的endpoint以查看部門列表時，則出現以下錯誤，

'Cannot apply DjangoModelPermissions on a view that '
AssertionError: Cannot apply DjangoModelPermissions on a view that does not set `.queryset` or have a `.get_queryset()` method.

究竟是什么導致錯誤？ 我已經調查過，但無法解決。

更新

class DepartMentDetail(APIView):
    """
    Retrieve, update or delete a department instance.
    """

    def get_object(self, pk):

        try:
            return Department.objects.get(pk=pk)
        except Department.DoesNotExist:
            raise Http404

    def get(self,request,pk,format=None):

        department = self.get_object(pk)
        serializer = DepartmentSerializer(department)
        return Response(serializer.data)

    def put(self,request,pk,format=None):
        department = self.get_object(pk)
        serializer = DepartmentSerializer(department,data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data)
    return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

    def delete(self, request, pk, format=None):
        department = self.get_object(pk)
        department.delete()
        return Response(status=status.HTTP_204_NO_CONTENT)

Answer 1

DjangoRestFramework要求您在視圖上設置queryset類參數或實現get_queryset方法。 應用權限等級時會進行檢查。 因為DjangoModelPermissionsOrAnonReadOnly具有has_permission方法，如下所示，並且此方法檢查您的視圖是否具有queryset變量或get_queryset方法。

def has_permission(self, request, view):
    # Workaround to ensure DjangoModelPermissions are not applied
    # to the root view when using DefaultRouter.
    if getattr(view, '_ignore_model_permissions', False):
        return True

    if hasattr(view, 'get_queryset'):
        queryset = view.get_queryset()
    else:
        queryset = getattr(view, 'queryset', None)

    assert queryset is not None, (
        'Cannot apply DjangoModelPermissions on a view that '
        'does not set `.queryset` or have a `.get_queryset()` method.'
    )

    perms = self.get_required_permissions(request.method, queryset.model)

    return (
        request.user and
        (request.user.is_authenticated() or not self.authenticated_users_only) and
        request.user.has_perms(perms)
    )

如您所見， has_permission方法使queryset變量assert您的視圖應如下所示

class DepartMentList(APIView):
    """
    List of all departments or create a department
    """
    queryset = Department.objects.all()

    def get(self, request, format=None):
        serializer = DepartmentSerializer(self.queryset)
        return Response(serializer.data)

    def post(self, request, format=None):
        serializer = DepartmentSerializer(data=request.data)

        if serializer.is_valid():
            serializer.save()
            return   Response(serializer.data,status=status.HTTP_201_CREATED)
        return Response(serializer._errors, status=status.HTTP_400_BAD_REQUEST)

PS使用http://www.django-rest-framework.org/api-guide/generic-views/它更干凈））