drf-----序列化定义字段的两种方法_serialzer自定义序列化字段

第一种   借用SerializerMethodField  方法，定义get_字段名  方法

 
 
 
author_list= models.Author.objects.all()
ser=AuthorSerialzer(instance=author_list,many=True)
 
 
#定义字段
    author_detail=serializers.SerializerMethodField()
    def get_author_detail(self,obj):
        #obj   是要序列化的对象   就是instance =的值
        msg={'email':obj.author_detail.email,"age":obj.author_detail.age}
        return msg

 前端展示

{
    "code": 104,
    "msg": "成功",
    "data": [
        {
            "id": 3,
            "author_detail": {
                "email": "2494272315@qq.com",
                "age": 18
            },
            "name": "tao",
            "phone": 156789
        }
    ]
}

第二种

序列化类中serializers.py

### 2.2 定制字段方式2
class BookSerialzier(serializers.Serializer):
    name = serializers.CharField()
    price = serializers.CharField()
    # 1 序列化类中这样写
    # 2 到表模型中写一个方法，方法名必须叫 publish_detail，这个方法返回什么，这个字段的value就是什么
    publish_detail = serializers.DictField()
 
    author_list=serializers.ListField()
 
 
DictField,ListField

 models.py

class Book(models.Model):
    name = models.CharField(max_length=32)
    price = models.CharField(max_length=32)
    publish = models.ForeignKey(to='Publish', on_delete=models.SET_NULL, null=True)
    authors = models.ManyToManyField(to='Author')
 
    def sb_name(self):
        return self.name + '_sb'
 
    @property
    def publish_detail(self):
        return {'id': self.publish.pk, 'name': self.publish.name, 'addr': self.publish.addr}
 
    def author_list(self):
        l = []
        for author in self.authors.all():
            l.append({'id': author.pk, 'name': author.name, 'phone': author.phone, 'age': author.author_detail.age})
        return l