django - django.core.exceptions.AppRegistryNotReady：加载 wsgi.py 时尚未加载应用程序

Question

我无法确定 Django 和 wsgi 的问题。该应用程序在我的本地测试服务器上运行良好，并且在本地 apache WAMP 设置上也运行良好（没有任何 venvs）。再次将其部署到我们的 Linux 服务器时，本地测试服务器会运行（与 makemigrations、migrate 或 check 一样）：

python3 manage.py runserver
/home/www-test/myapp-venv/lib/python3.7/site-packages/requests/__init__.py:91: RequestsDependencyWarning: urllib3 (1.25.8) or chardet (2.0.3) doesn't match a supported version!
  RequestsDependencyWarning)
/home/www-test/myapp-venv/lib/python3.7/site-packages/requests/__init__.py:91: RequestsDependencyWarning: urllib3 (1.25.8) or chardet (2.0.3) doesn't match a supported version!
  RequestsDependencyWarning)
Performing system checks...

System check identified no issues (0 silenced).
March 18, 2020 - 16:22:20
Django version 2.2.11, using settings 'myapp.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CONTROL-C.



 python3 manage.py check
 /home/www-test/myapp-venv/lib/python3.7/site-packages/requests/__init__.py:91: 
 RequestsDependencyWarning: urllib3 (1.25.8) or chardet (2.0.3) doesn't match a supported version!
 RequestsDependencyWarning)
 System check identified no issues (0 silenced).

但是，当我尝试在 Linux 机器上使用 wsgi/Apache 部署它时，我得到了

Traceback (most recent call last):
  File "myapp/wsgi.py", line 20, in <module>
    application = get_wsgi_application()
  File "/home/www-test/.local/lib/python3.7/site-packages/django/core/wsgi.py", line 12, in get_wsgi_application
    django.setup(set_prefix=False)
  File "/home/www-test/.local/lib/python3.7/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/home/www-test/.local/lib/python3.7/site-packages/django/apps/registry.py", line 91, in populate
    app_config = AppConfig.create(entry)
  File "/home/www-test/.local/lib/python3.7/site-packages/django/apps/config.py", line 90, in create
    module = import_module(entry)
  File "/usr/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 953, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 953, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/www-test/myapp/myapp/maintenance.py", line 9, in <module>
    from imageplus.models import ImagePlus
  File "/home/www-test/myapp/imageplus/models.py", line 6, in <module>
    from userprofile.models import Userprofile
  File "/home/www-test/myapp/userprofile/models.py", line 5, in <module>
    from django.contrib.auth.models import User
  File "/home/www-test/.local/lib/python3.7/site-packages/django/contrib/auth/models.py", line 2, in <module>
    from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
  File "/home/www-test/.local/lib/python3.7/site-packages/django/contrib/auth/base_user.py", line 47, in <module>
    class AbstractBaseUser(models.Model):
  File "/home/www-test/.local/lib/python3.7/site-packages/django/db/models/base.py", line 103, in __new__
    app_config = apps.get_containing_app_config(module)
  File "/home/www-test/.local/lib/python3.7/site-packages/django/apps/registry.py", line 252, in get_containing_app_config
    self.check_apps_ready()
  File "/home/www-test/.local/lib/python3.7/site-packages/django/apps/registry.py", line 135, in check_apps_ready
    raise AppRegistryNotReady("Apps aren't loaded yet.")
django.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet.

我怀疑它与 venv 或缺少路径有关，但我不知道从哪里开始。wsgi.py 看起来像这样：

"""
WSGI config for myapp project.

It exposes the WSGI callable as a module-level variable named ``application``.

For more information on this file, see
https://docs.djangoproject.com/en/2.2/howto/deployment/wsgi/
"""

import os, sys

from django.core.wsgi import get_wsgi_application

os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'myapp.settings')
sys.path.append('/home/www-test/myapp/myapp')
sys.path.append('/home/www-test/myapp')
sys.path.append('/home/www-test/myapp-venv/lib/python3.7/site-packages')


application = get_wsgi_application()

任何关于从哪里开始寻找此错误的建议将不胜感激。

[编辑：]

我将错误进一步追踪到 myapp 的 apps.py，如下所示：

from django.apps import AppConfig
from threading import Thread 
from django.utils import timezone
import time
import schedule
import os
from decouple import config

class SebastianConfig(AppConfig):
    name = 'myapp'

    def ready(self):
        if os.environ.get('RUN_MAIN', None) == 'true':
            return

        import myapp.signals

        if config('AUTOMAINTENANCE', cast=bool)==False:
            print ('[myApp]: auto maintenance is disabled')
            return

        from myapp.maintenance import maintenance

        def scheduler_demon():
            while True:
                schedule.run_pending()
                time.sleep(60)  

        def aliveping():
            print(f'[myApp]:ping {timezone.now()}')

        schedule.every(5).minutes.do(aliveping)
        schedule.every(24).hours.do(maintenance)
        schedule.run_all()

        worker=Thread(target=scheduler_demon,args=(),)
        worker.daemon=True
        worker.start() 

从理论上讲，这不会像我对 Django 的理解那样引起问题。它也是唯一进口的现场维护。

现在有趣的是，我删除了那段话，wsgi 就像一个魅力一样工作。我再次添加了这段话，令人惊讶的是它仍然像魅力一样起作用？！！？

标签： djangoapachewsgipython-venv