heroku 部署，关系“django_session”不存在

Question

我在 Python+Django 上构建了一个简单的浏览器游戏，它使用 session/cookies 来跟踪分数。游戏本身没有任何数据库。当我部署到heroku时，我得到了这种类型的错误

ProgrammingError at /
relation "django_session" does not exist
LINE 1: SELECT (1) AS "a" FROM "django_session" WHERE "django_sessio...
                               ^
Request Method: GET
Request URL:    https://lesgogo.herokuapp.com/
Django Version: 3.0.7
Exception Type: ProgrammingError
Exception Value:    
relation "django_session" does not exist
LINE 1: SELECT (1) AS "a" FROM "django_session" WHERE "django_sessio...
                               ^
Exception Location: /app/.heroku/python/lib/python3.8/site-packages/django/db/backends/utils.py in _execute, line 86
Python Executable:  /app/.heroku/python/bin/python
Python Version: 3.8.3
Python Path:    
['/app/.heroku/python/bin',
 '/app',
 '/app/.heroku/python/lib/python38.zip',
 '/app/.heroku/python/lib/python3.8',
 '/app/.heroku/python/lib/python3.8/lib-dynload',
 '/app/.heroku/python/lib/python3.8/site-packages']
Server time:    Sat, 13 Jun 2020 04:00:23 +0000

我尝试过的：

• 在没有 views.py（该文件中带有会话的逻辑部分）的情况下成功部署到 heroku，img 和 css 等静态文件已正确加载/显示
• 我是here 并尝试过：

python manage.py migrate --fake sessions zero
# then your sessions migrate will be
python manage.py showmigrations
sessions
 [ ] 0001_initial
# then migrate with --fake-initial again
python manage.py migrate --fake-initial

添加，然后推回heroku，没有用。

• 我的 settings.py 文件几乎是默认的，所以所有中间件都在那里，我只是添加了我的应用名称

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

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',
]

我正在使用的版本

python-3.8.3
asgiref==3.2.7
dj-database-url==0.5.0
Django==3.0.7
django-heroku==0.3.1
gunicorn==20.0.4
psycopg2==2.8.5
pytz==2020.1
sqlparse==0.3.1
whitenoise==5.1.0

PS：这是我的第一篇文章。谢谢！

Answer 1

在这个链接ProgrammingError: relation "django_session" does not exist（就是你上面提到的链接）中的建议之后，我做了

heroku run python manage.py makemigrations sessions
heroku run python manage.py migrate sessions