Serializers 序列化组件

# 第一版 用values以及JsonResponse实现序列化(发现就简单的数据拿出来还这么费劲)
class BookView(View):
    def get(self, request):
        book_queryset = Book.objects.values("id", "title", "pub_time", "publisher")
        book_list = list(book_queryset)
        ret = []
        # 如果我们需要取外键关联的字段信息 需要循环获取外键 再去数据库查然后拼接成我们想要的
        for book in book_list:
            book["publisher"] = {
                "id": book["publisher"],
                "title": Publisher.objects.filter(id=book["publisher"]).first().title,
            }
            ret.append(book)
        # return HttpResponse(ret)  #
        return JsonResponse(ret, safe=False, json_dumps_params={"ensure_ascii": False})

# 第二版 django的序列化:用Django的serialize实现的序列化 不能序列化外键关系
class BookView(View):
    def get(self, request):
        book_queryset = Book.objects.all()
        data = serializers.serialize("json", book_queryset, ensure_ascii=False)
        return HttpResponse(data)

class BookSerializer(serializers.Serializer):
    id = serializers.IntegerField()
    title = serializers.CharField(max_length=32)
    pub_time = serializers.DateField()
    category = serializers.CharField(source="get_category_display")

    publisher = PublisherSerializer()
    authors = AuthorSerializer(many=True)

class BookView(APIView):
    def get(self, request):
        book_queryset = Book.objects.all()
        # 用序列化器进行序列化
        ser_obj = BookSerializer(book_queryset, many=True)
        return Response(ser_obj.data)