Core View Base Classes

DRF provides two fundamental view base classes:

• APIView: The top-level parent class for all DRF views
• GenericAPIView: Extends APIView with additional functionality

Basic Implementation with APIView

# views.py
from rest_framework.views import APIView
from rest_framework.response import Response

class BookAPIView(APIView):
    def get(self, request):
        books = Book.objects.all()
        serializer = BookSerializer(books, many=True)
        return Response(serializer.data)

    def post(self, request):
        serializer = BookSerializer(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=201)
        return Response(serializer.errors, status=400)

Enhanced Implementation with GenericAPIView

# views.py
from rest_framework.generics import GenericAPIView

class BookGenericView(GenericAPIView):
    queryset = Book.objects.all()
    serializer_class = BookSerializer

    def get(self, request):
        books = self.get_queryset()
        serializer = self.get_serializer(books, many=True)
        return Response(serializer.data)

View Mixins for Common Operations

DRF provides five mixins for common CRUD operations:

• CreateModelMixin: Handles POST requests
• ListModelMixin: Handles GET all requests
• RetrieveModelMixin: Handles GET single requests
• UpdateModelMixin: Handles PUT/PATCH requests
• DestroyModelMixin: Handles DELETE requests

# views.py
from rest_framework.mixins import (
    CreateModelMixin, ListModelMixin,
    RetrieveModelMixin, UpdateModelMixin,
    DestroyModelMixin
)

class BookMixinView(GenericAPIView, ListModelMixin, CreateModelMixin):
    queryset = Book.objects.all()
    serializer_class = BookSerializer

    def get(self, request, *args, **kwargs):
        return self.list(request, *args, **kwargs)

    def post(self, request, *args, **kwargs):
        return self.create(request, *args, **kwargs)

Pre-built View Subclasses

DRF offers nine pre-configured view subclasses combining mixins:

1. CreateAPIView
2. ListAPIView
3. RetrieveAPIView
4. DestroyAPIView
5. UpdateAPIView
6. ListCreateAPIView
7. RetrieveUpdateAPIView
8. RetrieveDestroyAPIView
9. RetrieveUpdateDestroyAPIView

# views.py
from rest_framework.generics import ListCreateAPIView, RetrieveUpdateDestroyAPIView

class BookListView(ListCreateAPIView):
    queryset = Book.objects.all()
    serializer_class = BookSerializer

class BookDetailView(RetrieveUpdateDestroyAPIView):
    queryset = Book.objects.all()
    serializer_class = BookSerializer

GenericAPIView Key Features

• queryset: Defines the model queryset
• serializer_class: Specifies the serializer
• lookup_field: Customizes the lookup parameter (defaults to 'pk')
• get_queryset(): Returns the queryset (can be overridden)
• get_serializer(): Returns the serializer intsance
• get_object(): Retrieves a single model instance