ModelSerializer 中的附加信息不在使用的模型中答案

【问题标题】：Additional Information in ModelSerializer are not in used ModelModelSerializer 中的附加信息不在使用的模型中
【发布时间】：2026-01-29 12:30:02
【问题描述】：

我有一个类似的问题：Additional (non model) fields in ModelSerializer

我想用这样的模型序列化器创建一个对象：

class CreateUserSerializer(serializers.ModelSerializer):
    user = serializers.CharField(source="username")
    password = serializers.CharField()
    password2 = serializers.WritableField() 
    ...

    class Meta:
         model = User
     fields = ('user', "password", "password2", ...)

显然，我对保存密码2不感兴趣，只是为了比较。

理想情况下，这应该可以解决问题，但由于某些原因，它无法按预期工作：

def restore_object(self, attrs, instance=None):
    tags = attrs.pop('password2', None)
    obj = super(CreateUserSerializer, self).restore_object(attrs, instance)
    obj.tags = tags
    logging.info(u"Object gets restored, field 'password2' gets removed,  list with arguments for object: {0}".format(tags))
    return obj

我得到的错误是：

'User' object has no attribute 'password2'
 ...
 /home/jan/projekte/alarmapp/eclipse_workspace/AlarmServer/AlarmApp/src/external/rest_framework/fields.py in get_component

55. val = getattr(obj, attr_name)

知道为什么这不起作用吗？

【问题讨论】：

标签： django django-rest-framework

【解决方案1】：

似乎this small Gist 应该会有所帮助：

from django.contrib.auth.models import User
from rest_framework import serializers

class CreateUserSerializer(serializers.ModelSerializer):
    password2 = serializers.CharField()

    def validate_password2(self, attrs, source):
        password2 = attrs.pop(source)
        if attrs['password'] != password2:
            raise serializers.ValidationError('password mismatch')
        return attrs

    def to_native(self, obj):
        self.fields.pop('password2')
        return super(CreateUserSerializer, self).to_native(obj)

    class Meta:
        model = User

【讨论】：