Django-使用hmac后端注册唯一的电子邮件

from django.contrib.auth.models import AbstractUser
from django.db import models

class CustomUser(AbstractUser):
    email = models.EmailField(unique=True)

from django import forms
from .models import CustomUser

class RegistrationForm(forms.ModelForm):
    class Meta:
        model = CustomUser
        fields = ['email']

from django.shortcuts import render, redirect
from .forms import RegistrationForm

def register(request):
    if request.method == 'POST':
        form = RegistrationForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect('success')
    else:
        form = RegistrationForm()
    return render(request, 'register.html', {'form': form})

def success(request):
    return render(request, 'success.html')

from django.urls import path
from .views import register, success

urlpatterns = [
    path('register/', register, name='register'),
    path('success/', success, name='success'),
]