from django.db import models
 
## 추상 클래스 정의
class BaseModel(models.Model):
    created_at = models.DateTimeField(verbose_name="작성일시", auto_now_add=True)
    updated_at = models.DateTimeField(verbose_name="수정일시", auto_now=True)
 
    class Meta:
        abstract = True
 
class Post(BaseModel):
 
    CHOICES = (
        ('DIARY', '일기'),
        ('STUDY', '공부'),
        ('ETC', '기타')
    )
 
    id = models.AutoField(primary_key=True)
    title = models.CharField(verbose_name="제목", max_length=20)
    content = models.TextField(verbose_name="내용")
    writer = models.CharField(verbose_name="작성자", max_length=10)
    category = models.CharField(choices=CHOICES, max_length=20)

#accounts 앱 생성
django-admin startapp accounts

from django.db import models
from django.contrib.auth.models import AbstractUser
 
class User(AbstractUser):
    pass #해당 세션에서 바로 유저모델을 사용할 것은 아니기 때문에 pass로 넣는다.

...
AUTH_USER_MODEL = 'accounts.User'
...

python manage.py makemigrations
python manage.py migrate

from django.contrib import admin
from django.urls import path, include
from posts.views import *
 
urlpatterns = [
    path('admin/', admin.site.urls),
    path('', include('posts.urls')),
]

python manage.py createsuperuser

from django.contrib import admin
from .models import Post
 
# Register your models here.
admin.site.register(Post)

from django.contrib import admin
from .models import User
 
# Register your models here.
admin.site.register(User)

raise IntegrityError( django.db.utils.IntegrityError: The row in table 'posts_post' with primary key '1' has an invalid foreign key: posts_post.writer_id contains a value '***'hat does not have a corresponding value in accounts_user.id. ...