如何在Django Rest框架中使用电子邮件而不是用户名注册用户

from django.contrib.auth.tokens import default_token_generator
from django.core.mail import send_mail
from django.urls import reverse
from django.views import View
from rest_framework import status
from rest_framework.response import Response

from .serializers import UserSerializer

class UserRegistrationView(View):
    def post(self, request):
        serializer = UserSerializer(data=request.data)
        if serializer.is_valid():
            user = serializer.save()

            # 生成令牌
            token = default_token_generator.make_token(user)

            # 构建验证链接
            verification_url = reverse('user-verification')
            verification_url += f'?email={user.email}&token={token}'

            # 发送验证邮件
            send_mail(
                '请验证您的电子邮件地址',
                f'请点击以下链接验证您的电子邮件地址：\n\n{verification_url}',
                'noreply@example.com',
                [user.email],
                fail_silently=False,
            )

            return Response({'message': '注册成功，请检查您的电子邮件进行验证。'})
        else:
            return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

class UserVerificationView(View):
    def get(self, request):
        email = request.GET.get('email')
        token = request.GET.get('token')

        # 验证令牌
        user = User.objects.get(email=email)
        if default_token_generator.check_token(user, token):
            user.is_active = True
            user.save()
            return Response({'message': '电子邮件验证成功。'})
        else:
            return Response({'message': '电子邮件验证失败。'}, status=status.HTTP_400_BAD_REQUEST)