Django viewset has not attribute 'get_extra_actions'

Question

I am working with Django for a first time and I'm trying to build an API and I am following some tutorials and examples and it works right, but I am running the project now in a Raspberry Pi after install all the requirements and the project is failing with the following error:

    Performing system checks...  Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0xb547adb0> Traceback (most recent call last):   File "/home/pi/.local/lib/python3.5/site-packages/django/utils/autoreload.py", line 225, in wrapper     fn(*args, **kwargs)   File "/home/pi/.local/lib/python3.5/site-packages/django/core/management/commands/runserver.py", line 120, in inner_run     self.check(display_num_errors=True)   File "/home/pi/.local/lib/python3.5/site-packages/django/core/management/base.py", line 364, in check     include_deployment_checks=include_deployment_checks,   File "/home/pi/.local/lib/python3.5/site-packages/django/core/management/base.py", line 351, in _run_checks     return checks.run_checks(**kwargs)   File "/home/pi/.local/lib/python3.5/site-packages/django/core/checks/registry.py", line 73, in run_checks     new_errors = check(app_configs=app_configs)   File "/home/pi/.local/lib/python3.5/site-packages/django/core/checks/urls.py", line 13, in check_url_config     return check_resolver(resolver)   File "/home/pi/.local/lib/python3.5/site-packages/django/core/checks/urls.py", line 23, in check_resolver     return check_method()   File "/home/pi/.local/lib/python3.5/site-packages/django/urls/resolvers.py", line 397, in check     for pattern in self.url_patterns:   File "/home/pi/.local/lib/python3.5/site-packages/django/utils/functional.py", line 36, in __get__     res = instance.__dict__[self.name] = self.func(instance)   File "/home/pi/.local/lib/python3.5/site-packages/django/urls/resolvers.py", line 536, in url_patterns     patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)   File "/home/pi/.local/lib/python3.5/site-packages/django/utils/functional.py", line 36, in __get__     res = instance.__dict__[self.name] = self.func(instance)   File "/home/pi/.local/lib/python3.5/site-packages/django/urls/resolvers.py", line 529, in urlconf_module     return import_module(self.urlconf_name)   File "/usr/lib/python3.5/importlib/__init__.py", line 126, in import_module     return _bootstrap._gcd_import(name[level:], package, level)   File "<frozen importlib._bootstrap>", line 986, in _gcd_import   File "<frozen importlib._bootstrap>", line 969, in _find_and_load   File "<frozen importlib._bootstrap>", line 958, in _find_and_load_unlocked   File "<frozen importlib._bootstrap>", line 673, in _load_unlocked   File "<frozen importlib._bootstrap_external>", line 673, in exec_module   File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed   File "/home/pi/Projects/openvpn-monitor/openvpnmonitor/urls.py", line 24, in <module>     url(r'^api/', include('openvpnmonitor.api.urls')),   File "/home/pi/.local/lib/python3.5/site-packages/django/urls/conf.py", line 34, in include     urlconf_module = import_module(urlconf_module)   File "/usr/lib/python3.5/importlib/__init__.py", line 126, in import_module     return _bootstrap._gcd_import(name[level:], package, level)   File "<frozen importlib._bootstrap>", line 986, in _gcd_import   File "<frozen importlib._bootstrap>", line 969, in _find_and_load   File "<frozen importlib._bootstrap>", line 958, in _find_and_load_unlocked   File "<frozen importlib._bootstrap>", line 673, in _load_unlocked   File "<frozen importlib._bootstrap_external>", line 673, in exec_module   File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed   File "/home/pi/Projects/openvpn-monitor/openvpnmonitor/api/urls.py", line 16, in <module>     urlpatterns += router.urls   File "/home/pi/.local/lib/python3.5/site-packages/rest_framework/routers.py", line 101, in urls     self._urls = self.get_urls()   File "/home/pi/.local/lib/python3.5/site-packages/rest_framework/routers.py", line 363, in get_urls     urls = super(DefaultRouter, self).get_urls()   File "/home/pi/.local/lib/python3.5/site-packages/rest_framework/routers.py", line 261, in get_urls     routes = self.get_routes(viewset)   File "/home/pi/.local/lib/python3.5/site-packages/rest_framework/routers.py", line 176, in get_routes     extra_actions = viewset.get_extra_actions() AttributeError: type object 'SessionViewSet' has no attribute 'get_extra_actions' 

My views.py has the following code:

from django.shortcuts import render  from rest_framework import viewsets from .models import Session from .serializers import SessionSerializer  from rest_framework.views import APIView, Response   class SessionViewSet(APIView):     queryset = Session.objects.all()     serializer_class = SessionSerializer      def get(self, request, format=None):         return Response("test") 

I really don't know why is working on my laptop but it is not working on my Raspberry Pi.

Has this happened to someone or anyone knows why is happening this?

Thank you so much!

Edit:

Here is my urls.py

from django.conf.urls import url from rest_framework import routers from openvpnmonitor.api.views import SessionViewSet  router = routers.DefaultRouter() router.register(r'sessions', SessionViewSet)  urlpatterns = [     url(r'sessions', SessionViewSet.as_view()),     url(r'^docs/', schema_view), ]  urlpatterns += router.urls 

Answer 1

You've called it a viewset, but that doesn't make it one; you inherit from APIView which is a standalone generic view, not a viewset.

A viewset needs to inherit from viewsets.ViewSet.