モデルを定義する

from django.contrib.auth.models import AbstractBaseUser
 
 
class User(AbstractBaseUser):
    pass  # ここにフィールドを定義していく

class AbstractBaseUser(models.Model):
    password = models.CharField(_("password"), max_length=128)
    last_login = models.DateTimeField(_("last login"), blank=True, null=True)
 
    is_active = True
 
    REQUIRED_FIELDS = []

from django.contrib.auth.models import (
    AbstractBaseUser,
    BaseUserManager,
    PermissionsMixin,
)
from django.contrib.auth.models import AbstractUser
from django.db import models
from django.utils.translation import gettext_lazy as _
from django.utils import timezone
 
# Create your models here.
 
 
class User(AbstractBaseUser, PermissionsMixin):
    username = models.CharField(max_length=150, unique=True, verbose_name="ユーザー名")
    last_name = models.CharField(max_length=150, blank=True, verbose_name="姓")
    first_name = models.CharField(max_length=30, blank=True, verbose_name="名")
    email = models.EmailField(unique=True, verbose_name="メールアドレス")
 
    COURSE_CHOICES = (
        ("l1", "文科一類"),
        ("l2", "文科二類"),
        ("l3", "文科三類"),
        ("s1", "理科一類"),
        ("s2", "理科二類"),
        ("s3", "理科三類"),
    )
    course = models.CharField(max_length=2, choices=COURSE_CHOICES, verbose_name="科類")
 
    FACULTY_CHOICES = (
        ("law", "法学部"),
        ("med", "医学部"),
        ("eng", "工学部"),
        ("lit", "文学部"),
        ("sci", "理学部"),
        ("agr", "農学部"),
        ("eco", "経済学部"),
        ("art", "教養学部"),
        ("edu", "教育学部"),
        ("pha", "薬学部"),
    )
    faculty = models.CharField(
        max_length=3, choices=FACULTY_CHOICES, blank=True, verbose_name="学部"
    )
 
    department = models.CharField(max_length=150, blank=True, verbose_name="学科")
 
    GRADE_CHOICES = (
        ("B1", "1年生"),
        ("B2", "2年生"),
        ("B3", "3年生"),
        ("B4", "4年生"),
        ("B5", "5年生"),
        ("B6", "6年生"),
    )
    grade = models.CharField(max_length=2, choices=GRADE_CHOICES, default="B1", verbose_name="学年")
 
    # 班は後で追加
 
    # 期は後で追加（年によって動的に変わるため）
 
    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)
 
    USERNAME_FIELD = "username"
    REQUIRED_FIELDS = ["email"]

python manage.py makemigrations

python manage.py migrate

from django.contrib.auth.models import BaseUserManager
 
 
class CustomUserManager(BaseUserManager):
    def create_user(self, username, email, password=None):
        if not email:
            raise ValueError("Users must have an email address")
 
        user = self.model(
            username=username,
            email=self.normalize_email(email),
        )
 
        user.set_password(password)
        user.save(using=self._db)
        return user
 
    def create_superuser(self, username, email, password):
        user = self.create_user(
            username=username,
            email=self.normalize_email(email),
            password=password,
        )
 
        user.is_staff = True
        user.is_active = True
        user.is_superuser = True
        user.save(using=self._db)
        return user

class User(AbstractBaseUser):
    # 省略
 
    objects = CustomUserManager()

from django.contrib import admin
from django.contrib.auth.admin import UserAdmin
 
from .models import User
 
 
@admin.register(User)
class CustomUserAdmin(UserAdmin):
    fieldsets = (
        (None, {"fields": ("username", "password")}),
        (
            "Personal info",
            {
                "fields": (
                    "last_name",
                    "first_name",
                    "email",
                    "course",
                    "faculty",
                    "department",
                    "grade",
                )
            },
        ),
        (
            "Permissions",
            {
                "fields": (
                    "is_active",
                    "is_staff",
                )
            },
        ),
        ("Important dates", {"fields": ("last_login", "date_joined")}),
    )
    list_display = (
        "username",
        "email",
        "last_name",
        "first_name",
        "is_staff",
    )
    search_fields = ("username", "email", "last_name", "first_name")
    ordering = ("username",)
 
    filter_horizontal = ()
    list_filter = ()

AUTH_USER_MODEL = "accounts.User"

python manage.py createsuperuser

ユーザー名:
メールアドレス:
Password:
Password (again):
Superuser created successfully.