Creating my first test case, failing.

[Filbert]

Consider this what seems to be a simple Django/DRF API which works:

class CourseViewSet(viewsets.ModelViewSet):
  queryset = Course.objects.all()
  serializer_class = CourseSerializer

router = DefaultRouter()
router.register(r'courses', CourseViewSet)

urlpatterns = [
   path('', include(router.urls)),
]

POST to: http://localhost:9000/courses/ works from cURL

But this code:

class CourseAPITest(TestCase):
  def setUp(self):
    self.client = APIClient()
    self.course_data = {'description': 'course number 1', 'name': 'intro to something'}
    self.response = self.client.post(reverse('courses'),          self.course_data, format='json')

Gives me the error:

django.urls.exceptions.NoReverseMatch: Reverse for 'courses' not found. 'courses' is not a valid view function or pattern name.

[Muhammad Juwaini Abdul Rahman]

It's not reverse('courses') alone. Probably reverse('courses-create') or something like that.

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[Filbert]

*sigh* same error:

django.urls.exceptions.NoReverseMatch: Reverse for 'courses-create' not found. 'courses-create' is not a valid view function or pattern name.

[Gajanan Kathar]

Use "basename" parameter while registering router. 

router.register(r'courses', CourseViewSet, basename="courses")

And then reverse using this basename and operation like "courses-list".

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[Bayodele Oguntomiloye]

Check your url. This error usually show up when  there's no url with the name provided for the reverse function 

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[Muhammad Juwaini Abdul Rahman]

Obviously. You need to know how your routers generate the URL endpoint.

After reading DRF, my best guess would be either 'courses-list' or 'course-list'.