herokuにdeployしたDjangoアプリケーションのデータベースがmigrateできない

Question

問題点

herokuにdeployしたDjangoアプリケーションのデータベースがmigrateできない

詳細

ローカルでは、問題なくmigrateできるアプリがherokuにdeployするとうまくmigrateが動作しなくなる。

具体的な状況は、Djangoでデータベースを使用しない簡易的なアプリケーションを作成後、ネットの様々な情報からsetting.pyなどを変更しherokuにdeployしたが、createsuperuserが作成出来ない。migrate自体にはOKの文字が出るが、showmigrationsでは[x]が１つもつかない。

発生している問題・エラーメッセージ

• python manage.py createsuperuser 実行時

(.env) ... % heroku run python manage.py createsuperuser
Running python manage.py createsuperuser on ⬢ serene-fortress-94071... up, run.9498 (Basic)

You have 18 unapplied migration(s). Your project may not work properly until you apply the migrations for app(s): admin, auth, contenttypes, sessions.
Run 'python manage.py migrate' to apply them.
Traceback (most recent call last):
  File "/app/.heroku/python/lib/python3.10/site-packages/django/db/backends/utils.py", line 89, in _execute
    return self.cursor.execute(sql, params)
  File "/app/.heroku/python/lib/python3.10/site-packages/django/db/backends/sqlite3/base.py", line 357, in execute
    return Database.Cursor.execute(self, query, params)
sqlite3.OperationalError: no such table: auth_user

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/app/manage.py", line 22, in <module>
    main()
  File "/app/manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "/app/.heroku/python/lib/python3.10/site-packages/django/core/management/__init__.py", line 446, in execute_from_command_line
    utility.execute()
  File "/app/.heroku/python/lib/python3.10/site-packages/django/core/management/__init__.py", line 440, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/app/.heroku/python/lib/python3.10/site-packages/django/core/management/base.py", line 402, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/app/.heroku/python/lib/python3.10/site-packages/django/contrib/auth/management/commands/createsuperuser.py", line 88, in execute
    return super().execute(*args, **options)
  File "/app/.heroku/python/lib/python3.10/site-packages/django/core/management/base.py", line 448, in execute
    output = self.handle(*args, **options)
  File "/app/.heroku/python/lib/python3.10/site-packages/django/contrib/auth/management/commands/createsuperuser.py", line 109, in handle
    default_username = get_default_username(database=database)

...

    return Database.Cursor.execute(self, query, params)
django.db.utils.OperationalError: no such table: auth_user

---

• python manage.py migrate 実行時

(.env) ... % heroku run python manage.py migrate       
Running python manage.py migrate on ⬢ serene-fortress-94071... up, run.7191 (Basic)
Operations to perform:
  Apply all migrations: admin, auth, contenttypes, sessions
Running migrations:
  Applying contenttypes.0001_initial... OK
  Applying auth.0001_initial... OK
  Applying admin.0001_initial... OK
  Applying admin.0002_logentry_remove_auto_add... OK
  Applying admin.0003_logentry_add_action_flag_choices... OK
  Applying contenttypes.0002_remove_content_type_name... OK
  Applying auth.0002_alter_permission_name_max_length... OK
  Applying auth.0003_alter_user_email_max_length... OK
  Applying auth.0004_alter_user_username_opts... OK
  Applying auth.0005_alter_user_last_login_null... OK
  Applying auth.0006_require_contenttypes_0002... OK
  Applying auth.0007_alter_validators_add_error_messages... OK
  Applying auth.0008_alter_user_username_max_length... OK
  Applying auth.0009_alter_user_last_name_max_length... OK
  Applying auth.0010_alter_group_name_max_length... OK
  Applying auth.0011_update_proxy_permissions... OK
  Applying auth.0012_alter_user_first_name_max_length... OK
  Applying sessions.0001_initial... OK

---

• python manage.py showmigrations 実行時

(.env) ... % heroku run python manage.py showmigrations
Running python manage.py showmigrations on ⬢ serene-fortress-94071... up, run.5713 (Basic)
admin
 [ ] 0001_initial
 [ ] 0002_logentry_remove_auto_add
 [ ] 0003_logentry_add_action_flag_choices
app
 (no migrations)
auth
 [ ] 0001_initial
 [ ] 0002_alter_permission_name_max_length
 [ ] 0003_alter_user_email_max_length
 [ ] 0004_alter_user_username_opts
 [ ] 0005_alter_user_last_login_null
 [ ] 0006_require_contenttypes_0002
 [ ] 0007_alter_validators_add_error_messages
 [ ] 0008_alter_user_username_max_length
 [ ] 0009_alter_user_last_name_max_length
 [ ] 0010_alter_group_name_max_length
 [ ] 0011_update_proxy_permissions
 [ ] 0012_alter_user_first_name_max_length
contenttypes
 [ ] 0001_initial
 [ ] 0002_remove_content_type_name
sessions
 [ ] 0001_initial

該当のソースコード

"""
Django settings for AutoPost project.

Generated by 'django-admin startproject' using Django 4.1.6.

For more information on this file, see
https://docs.djangoproject.com/en/4.1/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/4.1/ref/settings/
"""

from pathlib import Path
import dj_database_url
import os

# Build paths inside the project like this: BASE_DIR / 'subdir'.
BASE_DIR = Path(__file__).resolve().parent.parent
# BASE_DIR = dev/APapp/AutoPost

ALLOWED_HOSTS = ['.herokuapp.com']


# Application definition

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'app',
]

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

ROOT_URLCONF = 'AutoPost.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [
            BASE_DIR / 'app' / 'templates'
        ],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

WSGI_APPLICATION = 'AutoPost.wsgi.application'


# Database
# https://docs.djangoproject.com/en/4.1/ref/settings/#databases

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': 'name',
        'USER': 'user',
        'PASSWORD': '',
        'HOST': 'host',
        'PORT': '',
    }
}


# Password validation
# https://docs.djangoproject.com/en/4.1/ref/settings/#auth-password-validators

AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]


# Internationalization
# https://docs.djangoproject.com/en/4.1/topics/i18n/

LANGUAGE_CODE = 'ja'

TIME_ZONE = 'Asia/Tokyo'

USE_I18N = True

USE_TZ = True


# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/4.1/howto/static-files/

STATIC_URL = 'static/'
STATIC_ROOT = os.path.join(BASE_DIR, 'staticfiles')

# Default primary key field type
# https://docs.djangoproject.com/en/4.1/ref/settings/#default-auto-field

DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'

db_from_env = dj_database_url.config(conn_max_age=600, ssl_require=True)
DATABASES['default'].update(db_from_env)

DEBUG = False

try:
    # 存在する場合、ローカルの設定読み込み
    from .local_settings import *
except ImportError:
    pass

if not DEBUG:
    SECRET_KEY = os.environ['SECRET_KEY']
    import django_heroku #追加
    django_heroku.settings(locals())

試したこと

https://devcenter.heroku.com/ja/articles/django-app-configuration

↑のサイトを読みましたが、間違っているところに気づくことができませんでした。

Answer 1

DjangoやHerokuには何も悪いことはなく、gitが悪さをしていたみたいでした。

heroku run ls ./AutoPost/

を実行すると、ローカル用の設定ファイルである「local_settings.py」が入っており、gitのキャッシュにファイルが残っており、それを永遠にpushし続けていたことが原因でした。

git rm -r --cached .

でキャッシュを削除した後に、add & commit & pushしたらlocal_settings.pyは無事削除され、データベースを正常に作成することができました。