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Prevent empty querysets to raise AssertionError. #2862

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Merged
merged 2 commits into from
Apr 22, 2015
Merged

Prevent empty querysets to raise AssertionError. #2862

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6f66798
Prevent empty `queryset`s to raises AssertionError.
ticosax Apr 22, 2015
24e9473
Improve error message.
ticosax Apr 22, 2015
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4 changes: 2 additions & 2 deletions rest_framework/permissions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -120,9 +120,9 @@ def has_permission(self, request, view):
if queryset is None and getattr(view, '_ignore_model_permissions', False):
return True

assert queryset, (
assert queryset is not None, (
'Cannot apply DjangoModelPermissions on a view that '
'does not have `.queryset` property.'
'does not have `.queryset` property nor redefines `.get_queryset()`.'
)
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I would change this lines to:

'Cannot apply DjangoModelPermissions on a view that '
'does not have `.queryset` property nor redefines `.get_queryset()`'

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alright


perms = self.get_required_permissions(request.method, queryset.model)
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13 changes: 13 additions & 0 deletions tests/test_permissions.py
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Expand Up @@ -41,9 +41,17 @@ def get_queryset(self):
return BasicModel.objects.all()


class EmptyListView(generics.ListCreateAPIView):
queryset = BasicModel.objects.none()
serializer_class = BasicSerializer
authentication_classes = [authentication.BasicAuthentication]
permission_classes = [permissions.DjangoModelPermissions]


root_view = RootView.as_view()
instance_view = InstanceView.as_view()
get_queryset_list_view = GetQuerySetListView.as_view()
empty_list_view = EmptyListView.as_view()


def basic_auth_header(username, password):
Expand Down Expand Up @@ -166,6 +174,11 @@ def test_options_updateonly(self):
self.assertIn('actions', response.data)
self.assertEqual(list(response.data['actions'].keys()), ['PUT'])

def test_empty_view_does_not_assert(self):
request = factory.get('/1', HTTP_AUTHORIZATION=self.permitted_credentials)
response = empty_list_view(request, pk=1)
self.assertEqual(response.status_code, status.HTTP_200_OK)


class BasicPermModel(models.Model):
text = models.CharField(max_length=100)
Expand Down