Django注册报错AttributeError：auth.User已替换为accounts.User

问题根源 #

注册视图中使用的Django自带UserCreationForm默认依赖系统原生auth.User模型，但你的项目已通过AUTH_USER_MODEL将用户模型替换为accounts.User，导致该表单仍尝试访问已被替换的auth.User管理器，触发错误。

解决方案 #

1. 创建自定义用户注册表单 #

在accounts应用下新建forms.py文件，编写基于自定义用户模型的注册表单：

from django.contrib.auth.forms import UserCreationForm
from django.contrib.auth import get_user_model

class CustomUserCreationForm(UserCreationForm):
    class Meta:
        model = get_user_model()
        fields = ('email',)

2. 修改注册视图，使用自定义表单 #

更新accounts/views.py，替换原有的UserCreationForm为自定义表单：

from django.shortcuts import render, redirect
from django.contrib.auth import login as auth_login
from django.contrib.auth import authenticate
from .forms import CustomUserCreationForm
from django.contrib import messages

def register(request):
    if request.method == 'POST':
        form = CustomUserCreationForm(request.POST)
        if form.is_valid():
            form.save()
            messages.success(request, 'Registration successful. You can now log in.')
            return redirect('login')
    else:
        form = CustomUserCreationForm()
    return render(request, 'register.html', {'form': form})

def login_view(request):
    if request.method == 'POST':
        email = request.POST['email']
        password = request.POST['password']
        user = authenticate(request, username=email, password=password)
        if user is not None:
            auth_login(request, user)
            return redirect('homepage')
        else:
            messages.error(request, 'Invalid email or password')
    return render(request, 'login.html')

3. 确认settings.py配置 #

确保项目根目录的settings.py中已正确配置自定义用户模型：

AUTH_USER_MODEL = 'accounts.User'

额外优化（可选） #

在login_view中，可直接传递email参数给authenticate，匹配自定义后端的参数设计，更直观：

user = authenticate(request, email=email, password=password)

内容的提问来源于stack exchange，提问作者Mayank Painkra