Creating ViewSets and routers

ViewSets allow you to define the interactions of your API and let DRF build URLs dynamically with a Router object. By using ViewSets, you can avoid repeating logic for multiple views. ViewSets include actions for the following standard operations:

• Create operation: create()
• Retrieve operation: list() and retrieve()
• Update operation: update() and partial_update()
• Delete operation: destroy()

Let’s create a ViewSet for the Course model. Edit the api/views.py file and add the following code highlighted in bold:

from django.db.models import Count
from rest_framework import generics
from rest_framework import viewsets
from courses.api.pagination import StandardPagination
from courses.api.serializers import CourseSerializer, SubjectSerializer
from courses.models import Course, Subject
class CourseViewSet(viewsets.ReadOnlyModelViewSet):
    queryset = Course.objects.prefetch_related('modules')
    serializer_class...