新增数据

class BooksView(APIView):

    # 新增
    def post(self,request):
        response_msg = {'status': 100, 'msg': '成功'}
        #修改才有instance，新增没有instance，只有data
        book_ser = *BookSerializer*(data=request.data)
        # book_ser = BookSerializer(request.data)  # 这个按位置传request.data会给instance，就报错了
        # 校验字段
        if book_ser.is_valid():
            book_ser.save()
            response_msg['data']=book_ser.data
        else:
            response_msg['status']=102
            response_msg['msg']='数据校验失败'
            response_msg['data']=book_ser.errors
        return Response(response_msg)
#ser.py 序列化类重写create方法
    def create(self, validated_data):
        instance=Book.objects.create(**validated_data)
        return instance
# urls.py
path('books/', views.BooksView.as_view()),