Django REST 프레임워크의 APIView

    （data）     ，    （data=data）     。
              json ,    json    

 path("books/",views.BooksView.as_view()),
 re_path("books/(?P\d+)/",views.BookView.as_view()),

class BooksView(APIView):
    def get(self,request):
        query_param = request.query_params
        item = request.GET #    query_param  
        print(item)
        print(query_param)
        queryset=BookInfo.objects.all()
        serializer = BookInfoSerializer(queryset,many=True) #    
        return Response(serializer.data)

    def post(self,request):
        data = request.data #                
        item1 = request.query_params
        print(item1)
        serializer = BookInfoSerializer(data=data) #       
        if serializer.is_valid() is False:
            print(serializer.errors) #          
        data = serializer.validated_data  #            
        print(data)
        BookInfo.objects.create(**data) #     
        return Response(serializer.data)
class BookView(APIView):
    def get(self,request,pk):
        try:
            data = BookInfo.objects.get(pk=pk)
        except BookInfo.DoesNotExist:
            return Response(status=404)
        serializer = BookInfoSerializer(data)
        return Response(serializer.data)
    def put(self,request,pk):
        try:
            book = BookInfo.objects.get(pk=pk)
        except BookInfo.DoesNotExist:
            return Response("this book is not exist",status=404)
        data = request.data #     
        serializer = BookInfoSerializer(data=data) #    
        serializer.is_valid(raise_exception=True)
        data=serializer.validated_data
        book.btitle = data["btitle"]
        bpub_date = datetime.strptime(str(data.get("bpub_date")), "%Y-%m-%d").date()
        book.bpub_date = bpub_date
        book.save()
        return Response(data,status=200)
    def delete(self,request,pk):
        try:
            book = BookInfo.objects.get(pk=pk)
        except BookInfo.DoesNotExist:
            return Response("this book is not exist",status=404)
        book.delete()

        return Response("The book has been deleted",status=200)