User モデルのクラスを作成しますが，これは Django のソースにある class AbstractUser の定義をコピーして class User に変更します．環境にもよりますが，Windows で Anaconda をインストールし，さらに仮想環境を利用している場合は，C:\Users\lecture\anaconda3\envs\py39\Lib\site-packages\django\contrib\auth\models.py にあるコードを一部利用します．また import も必要最低限だけを指定します．
users/models.py
from django.db import models
from django.contrib.auth.models import AbstractBaseUser, PermissionsMixin, UserManager
from django.contrib.auth.validators import UnicodeUsernameValidator
from django.utils import timezone
from django.utils.translation import gettext_lazy as _
class User(AbstractBaseUser, PermissionsMixin):
"""
An abstract base class implementing a fully featured User model with
admin-compliant permissions.
Username and password are required. Other fields are optional.
"""
username_validator = UnicodeUsernameValidator()
username = models.CharField(
_("username"),
max_length=150,
unique=True,
help_text=_(
"Required. 150 characters or fewer. Letters, digits and @/./+/-/_ only."
),
validators=[username_validator],
error_messages={
"unique": _("A user with that username already exists."),
},
)
first_name = models.CharField(_("first name"), max_length=150, blank=True)
last_name = models.CharField(_("last name"), max_length=150, blank=True)
email = models.EmailField(_("email address"), blank=True)
is_staff = models.BooleanField(
_("staff status"),
default=False,
help_text=_("Designates whether the user can log into this admin site."),
)
is_active = models.BooleanField(
_("active"),
default=True,
help_text=_(
"Designates whether this user should be treated as active. "
"Unselect this instead of deleting accounts."
),
)
date_joined = models.DateTimeField(_("date joined"), default=timezone.now)
objects = UserManager()
EMAIL_FIELD = "email"
USERNAME_FIELD = "username"
REQUIRED_FIELDS = ["email"]
class Meta:
verbose_name = _("user")
verbose_name_plural = _("users")
# abstract = True # この行は不要なのでコメントアウト
def clean(self):
super().clean()
self.email = self.__class__.objects.normalize_email(self.email)
def get_full_name(self):
"""
Return the first_name plus the last_name, with a space in between.
"""
full_name = "%s %s" % (self.first_name, self.last_name)
return full_name.strip()
def get_short_name(self):
"""Return the short name for the user."""
return self.first_name