在Django REST框架中验证用户的更新请求

from django.db import models

class User(models.Model):
    username = models.CharField(max_length=100)
    email = models.EmailField()
    age = models.IntegerField()

from rest_framework import serializers
from .models import User

class UserSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = ['username', 'email', 'age']

    def validate_email(self, value):
        # 字段级验证：检查邮箱是否已存在
        if User.objects.filter(email=value).exists():
            raise serializers.ValidationError("This email is already in use.")
        return value

    def validate(self, data):
        # 对象级验证：检查年龄是否合理
        if data['age'] < 0 or data['age'] > 150:
            raise serializers.ValidationError("Age must be between 0 and 150.")
        return data

from rest_framework import viewsets
from .models import User
from .serializers import UserSerializer

class UserViewSet(viewsets.ModelViewSet):
    queryset = User.objects.all()
    serializer_class = UserSerializer