serializer.ModelSerializer 的学习

#这里是serialize· VIEW视图模块的代码

class BookView(APIView):
    def get(self,request):
        queryset = Book.objects.all()
        serializer_class =BookSerializer
        serializer_obj = serializer_class(queryset,many=True)
        return Response(serializer_obj.data)

    def post(self,request):
        serializer_obj= BookSerializer(data=request.data)
        if serializer_obj.is_valid():
            serializer_obj.save()
            return Response(serializer_obj.data)
        else:
            return Response(serializer_obj.errors)

class BookEditView(APIView):
    def get(self,request,id):

        queryset_obj = Book.objects.filter(id=id).first()

        serializer_obj = BookSerializer(queryset_obj)

        return Response(serializer_obj.data)

    def put(self,request,id):
        query_obj = Book.objects.filter(id=id).first()
        serializer_obj = BookSerializer(query_obj,data=request.data,partial=True)
        if serializer_obj.is_valid():
            serializer_obj.save()
            return Response(serializer_obj.data)
        else:
            return Response(serializer_obj.errors)

    def delete(self,request,id):
        obj = Book.objects.filter(id=id).first()
        obj.delete()
        return Response("")

#这里是序列化，我们自己写的Serializer_class,继承serializers.ModelsSerializer

#这里我们要注意models模块中的Book_class包含的modles.ChoiceField(),modles.ForeignKeyField(),models.ManyToMany()字段，这些我们要特殊处理

#serializers.CharField

 1 class BookSerializer(serializers.ModelSerializer):
    category_info = serializers.CharField(source="get_category_display",read_only=True)
    def get_category_info(self,obj):
        return obj.get_category_display()
    publisher_info = serializers.SerializerMethodField(read_only=True)
    def get_publisher_info(self,obj):
        return {"title":obj.title}

    author_info = serializers.SerializerMethodField(read_only=True)
    def get_author_info(self,obj):
        obj_list = obj.author.all()
        return [{"name":obj.name} for obj in obj_list ]

    class Meta:
        model = Book
        fields = "__all__"
        extra_kwargs = {'category': {'write_only': True},
                        'publisher': {'write_only': True},'author': {'write_only': True}}