AssertionError with ViewSets

I’m using Python 3.6.3, Django 1.11.6, DRF 3.7.7, version 2.0.1 of this library, and FlatMultipleModelAPIViewSet.

The issue I’m having is:

AssertionError at <URI>
<ViewSet>.get_queryset() returned None
...
Exception Location: <Path>/rest_framework/permissions.py in _queryset, line 126

This is in the code here:

class FlatMultipleModelAPIViewSet(FlatMultipleModelMixin, GenericViewSet):
    def get_queryset(self):
        return None

And it’s running up against this check:

if hasattr(view, 'get_queryset'):
    queryset = view.get_queryset()
    assert queryset is not None, (
        '{}.get_queryset() returned None'.format(view.__class__.__name__)
    )
    return queryset

[MattBroach]

Hi @amar-muratovic, can you provide some sample code to reproduce the issue? It’s very hard to answer without knowing the specifics of your code.

Also, this seems like a separate issue than the one under discussion here. I’d recommend opening a new issue rather than continuing this current (probably unrelated) discussion.

[rlabrecque]

This pointed me in the right direction, All I really needed was

from rest_framework import permissions

class MultipleModelPermissions(permissions.DjangoModelPermissions):
    def has_permission(self, request, view):
        # Workaround to ensure DjangoModelPermissions are not applied
        # to the root view when using DefaultRouter.
        return True

MyMultipleModelViewset(FlatMultipleModelAPIViewSet):
     permission_classes = (MultipleModelPermissions,)

The only note is that a trailing s was missing.