urls.py

from django.conf.urls import include, url
from . import views

from rest_framework import routers
library_router = routers.SimpleRouter()
library_router.register(r'track-files', views.ManageTrackFileViewSet, 'track-files')

urlpatterns = [
    url(r'^library/',
        include((library_router.urls, 'instance'), namespace='library')),
]