Question

我正在使用django 1.9.5和休息框架3.x（DRF）。我刚刚从官方django rest框架开始学习教程，你可以说它已经开始使用DRF了，我已经写了 views < / em>， urls 了解api如何使用DRF，

视图

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)

网址

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)

这是我在为DEFAULT_PERMISSION_CLASSES添加以下rest framework dict的setting.py

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' ]

}

现在，当我为部门运行endpoint以查看部门列表时，我收到以下错误，

'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.

实际导致错误的是什么？我已经调查过，但无法弄清楚。

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要求您在视图中设置queryset类参数或实现get_queryset方法。它在应用权限类时检查它。由于DjangoModelPermissionsOrAnonReadOnly具有has_permission方法，如下所示，此方法会检查您的视图是否包含queryset变量或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)
    )

如您所见，has_permission方法为assert变量生成queryset 您的视图应如下所示

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)

P.S使用http://www.django-rest-framework.org/api-guide/generic-views/它更清洁））

django rest framework error无法在未设置`.queryset`或具有`.get_queryset（）`方法

1 个答案: