Django REST Framework - get_queryset: 'MyModel' object has no attribute 'model' - django

Question

i have problem editing my queryset in Django REST framwork.
Basically i need to filter my query and return single one, so my DRF view look like this:
class MyModelViewSet(viewsets.ModelViewSet):
queryset = MyModel.objects.all()
serializer_class = MyModelSerializer
def get_queryset(self):
start = self.kwargs['start']
end = self.kwargs['end']
qs, created = MyModel.objects.get_or_create(start=start, end=end)
return qs
So i return single model instance, but when i try to get access true the DRF web interface i get an error 'MyModel' object has no attribute 'model'
Traceback:
File "/Users/stay-wide-awake/code/env/lib/python3.4/site-packages/django/core/handlers/base.py" in get_response
132. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Users/stay-wide-awake/code/env/lib/python3.4/site-packages/django/views/decorators/csrf.py" in wrapped_view
58. return view_func(*args, **kwargs)
File "/Users/stay-wide-awake/code/env/lib/python3.4/site-packages/rest_framework/viewsets.py" in view
85. return self.dispatch(request, *args, **kwargs)
File "/Users/stay-wide-awake/code/env/lib/python3.4/site-packages/rest_framework/views.py" in dispatch
456. response = self.handle_exception(exc)
File "/Users/stay-wide-awake/code/env/lib/python3.4/site-packages/rest_framework/views.py" in dispatch
444. self.initial(request, *args, **kwargs)
File "/Users/stay-wide-awake/code/env/lib/python3.4/site-packages/rest_framework/views.py" in initial
359. self.check_permissions(request)
File "/Users/stay-wide-awake/code/env/lib/python3.4/site-packages/rest_framework/views.py" in check_permissions
304. if not permission.has_permission(request, self):
File "/Users/stay-wide-awake/code/asp/src/apps/api2/permission.py" in has_permission
34. perms = self.get_required_permissions(request.method, queryset.model)
Exception Type: AttributeError at /api/v2/geo/36.606111,-118.062778|36.578581,-120.291994/
Exception Value: 'MyModel' object has no attribute 'model'
Router and all other parts is OK (tested via prints :))
Will be grateful for any hints.

Answer 1

The object received via MyModel.objects.get_or_create(start=start, end=end) is not a queryset hence you are getting this error.
Django's get_or_create() returns a tuple of (object, created) where object is the retrieved or created object and created is a boolean specifying whether a new object was created.
In your get_queryset() method, you are setting queryset qs to this received object when infact its a model object.
get_queryset() should return a queryset and not a model object which you are doing.
You can do something like:
def get_queryset(self):
start = self.kwargs['start']
end = self.kwargs['end']
mymodel_obj, created = MyModel.objects.get_or_create(start=start, end=end)
return MyModel.objects.filter(id=mymodel_obj.id) # returns a queryset now