example-of-crud-in-django-with-rest-framework/app/library/views.py

# app/Library/views.py

from django.http import JsonResponse
from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework import status
from .serializers import BookSerializer
from .models import Book


def ping(request):
    data = {"ping": "pong!"}
    return JsonResponse(data)


class BookList(APIView):
    def get(self, request):
        books = Book.objects.all()
        serializer = BookSerializer(books, many=True)
        return Response(serializer.data, status=status.HTTP_200_OK)

    def post(self, request):
        serializer = BookSerializer(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)


class BookDetails(APIView):
    def get(self, request, pk):
        book = Book.objects.filter(pk=pk).first()
        if book:
            serializer = BookSerializer(book)
            return Response(serializer.data, status=status.HTTP_200_OK)
        return Response(status=status.HTTP_404_NOT_FOUND)

    def put(self, request, pk):
        book = Book.objects.filter(pk=pk).first()
        serializer = BookSerializer(book, data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_200_OK)
        elif not book:
            return Response(serializer.data, status=status.HTTP_404_NOT_FOUND)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

    def delete(self, request, pk):
        book = Book.objects.filter(pk=pk).first()
        if book:
            serializer = BookSerializer(book)
            book.delete()
            return Response(serializer.data, status=status.HTTP_200_OK)
        return Response(status=status.HTTP_404_NOT_FOUND)