python - Django Rest Framework - 如何反序列化模型类名基本序列化器？

Question

我有一个BaseModel类:

class BaseModel(models.Model):
    title = models.CharField(max_length=250, blank=True, null=True)
    class Meta:
        abstract = True

然后我有多个模型类来扩展此类，例如:

class Article(BaseModel):
    slug = models.SlugField(max_length=250, default=timezone.now, unique=True)

我的目标是在通过我的网络服务返回的 JSON 对象中包含一个字段来指示对象的类型(以便客户端应用程序可以轻松区分文章和电子商务产品)。类似于以下内容:

{
   "id": 1,
   "object_type: "article",
   "title": "some article",
   "slug": "some-article"
}

我想可能有一个类似于以下内容的 BaseModelSerializer 类:

class BaseModelSerializer(serializers.ModelSerializer):
    object_type = self.__class__.__name__ # ??? how to get the name/ label of the child class?

然后我可以有一个ArticleSerializer扩展BaseModelSerializer，如下所示:

class ArticleSerializer(BaseModelSerializer):
    class Meta:
        model = Article

如果这也可以通过修改 BaseModel 类来实现，我会很高兴。像下面这样的东西吗？

class BaseModel(models.Model):
    title = models.CharField(max_length=250, blank=True, null=True)
    object_type = self.__class__.__name__ # ??? how to get the name/ label of the child class?
    class Meta:
        abstract = True

Answer 1

使用SerializerMethodField .

class BaseModelSerializer(serializers.ModelSerializer):
    object_type = serializers.SerializerMethodField()

    def get_object_type(obj):
        return obj.__class__.__name__.lower()


class ArticleSerializer(BaseModelSerializer):
    class Meta:
        model = Article
        fields = ('object_type',)