「django.core.exceptions.AppRegistryNotReady：應用程序尚未加載。」對於啓動代碼

Question

所以我想添加一些代碼到我的Django 1.10應用程序，它只會在服務器啓動時運行。我從here和here上接受了如何操作的說明。每次我嘗試運行蟒控制檯我得到這個：

C:\Users\username\Envs\projectName [master ≡ +0 ~2 -0 !]> python manage.py shell 
Traceback (most recent call last): 
    File "manage.py", line 22, in <module> 
    execute_from_command_line(sys.argv) 
    File "C:\Users\username\AppData\Local\Programs\Python\Python35\lib\site-packages\django\core\management\__init__.py", line 367, in execute_from_command_line 
    utility.execute() 
    File "C:\Users\username\AppData\Local\Programs\Python\Python35\lib\site-packages\django\core\management\__init__.py", line 341, in execute 
    django.setup() 
    File "C:\Users\username\AppData\Local\Programs\Python\Python35\lib\site-packages\django\__init__.py", line 27, in setup 
    apps.populate(settings.INSTALLED_APPS) 
    File "C:\Users\username\AppData\Local\Programs\Python\Python35\lib\site-packages\django\apps\registry.py", line 85, in populate 
    app_config = AppConfig.create(entry) 
    File "C:\Users\username\AppData\Local\Programs\Python\Python35\lib\site-packages\django\apps\config.py", line 90, in create 
    module = import_module(entry) 
    File "C:\Users\username\AppData\Local\Programs\Python\Python3\lib\importlib\__init__.py", line 126, in import_module 
    return _bootstrap._gcd_import(name[level:], package, level) 
    File "<frozen importlib._bootstrap>", line 986, in _gcd_import 
    File "<frozen importlib._bootstrap>", line 969, in _find_and_load 
    File "<frozen importlib._bootstrap>", line 944, in _find_and_load_unlocked 
    File "<frozen importlib._bootstrap>", line 222, in_call_with_frames_removed 
    File "<frozen importlib._bootstrap>", line 986, in _gcd_import 
    File "<frozen importlib._bootstrap>", line 969, in _find_and_load 
    File "<frozen importlib._bootstrap>", line 958, in _find_and_load_unlocked 
    File "<frozen importlib._bootstrap>", line 673, in _load_unlocked 
    File "<frozen importlib._bootstrap_external>", line 662, in exec_module 
    File "<frozen importlib._bootstrap>", line 222, in_call_with_frames_removed 
    File "C:\Users\username\Envs\projectName\appName\apps.py", line 2, in <module> 
    import appName.osm as osm 
    File "C:\Users\username\Envs\projectName\appName\osm.py", line 4, in <module> 
    from .models import Country, Embassy 
    File "C:\Users\username\Envs\projectName\appName\models.py", line 38, in <module> 
    class Country(models.Model): 
    File "C:\Users\username\AppData\Local\Programs\Python\Python35\lib\site-packages\django\db\models\base.py", line 105, in __new__ 
    app_config = apps.get_containing_app_config(module) 
    File "C:\Users\username\AppData\Local\Programs\Python\Python35\lib\site-packages\django\apps\registry.py", line 237, in get_containing_app_config 
    self.check_apps_ready() 
    File "C:\Users\username\AppData\Local\Programs\Python\Python35\lib\site-packages\django\apps\registry.py", line 124, in check_apps_ready 
    raise AppRegistryNotReady("Apps aren't loaded yet.") 
django.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet. 

我試圖尋找這件事，但似乎每個人都誰得到這個異常是因爲它涉及到與Django的更新問題，但我一直在使用1.10現在很長一段時間（不知道我是否觸摸過任何舊的東西）。任何想法發生了什麼？

PROJECTNAME/APPNAME/apps.py：

from django.apps import AppConfig 
import finder.osm as osm # this seems to cause the issue 

class FinderConfig(AppConfig): 
    name = 'finder' 
    init = True 
    def ready(self): 
     pass 

PROJECTNAME/APPNAME/__ init__.py：

default_app_config = 'appName.apps.AppNameConfig' 

PROJECTNAME/APPNAME/models.py：

from django.db import models 

class Country(models.Model): 
    #... 

class Embassy(models.Model): 
    #... 

Answer 1

作爲@AndreyShipilov評論說，這是一個糟糕的進口案例，因爲你無法像AppConfig類那樣導入。一個修復我的解決辦法是進口進入AppConfig.ready（）

項目名稱/ APPNAME/apps.py：

from django.apps import AppConfig 


class FinderConfig(AppConfig): 
    import finder.osm as osm 
    name = 'finder' 
    init = True 
    def ready(self): 
     pass