Django: AttributeError: Manager isn't available; 'auth.User' has been swapped for 'users.User'

这是因为，自己扩展了django的用户认证模型：

#setting.py
AUTH_USER_MODEL = 'users.User'

解决方法

from django.contrib.auth.models import User
from django.contrib.auth import get_user_model

User = get_user_model()

官方文档