Django 1.9 django.core.exceptions.AppRegistryNotReady: Die Apps sind noch nicht geladen

Question

Der Versuch, django-shopify-sync in einem Django 1.9-Projekt zu verwenden. Beim Laden der Konfiguration für die App gibt es den folgenden Fehler, wahrscheinlich, weil es versucht, einige Modelle in der Konfiguration zu laden?

Versucht, die beiden Importe zu verschieben, die schließlich Modelle in die ready() -Funktion importieren, aber immer noch den gleichen Fehler bekommen. Culpirt Linien 2 und 3 in der folgenden Datei https://github.com/andresdouglas/django-shopify-sync/blob/master/shopify_sync/apps.py

Der Fehler ist:

$ python manage.py runserver 
Unhandled exception in thread started by <function wrapper at 0x10753e500> 
Traceback (most recent call last): 
    File "/Users/andres/.virtualenvs/[...]/lib/python2.7/site-packages/django/utils/autoreload.py", line 226, in wrapper 
    fn(*args, **kwargs) 
    File "/Users/andres/.virtualenvs/[...]/lib/python2.7/site-packages/django/core/management/commands/runserver.py", line 109, in inner_run 
    autoreload.raise_last_exception() 
    File "/Users/andres/.virtualenvs/[...]/lib/python2.7/site-packages/django/utils/autoreload.py", line 249, in raise_last_exception 
    six.reraise(*_exception) 
    File "/Users/andres/.virtualenvs/[...]/lib/python2.7/site-packages/django/utils/autoreload.py", line 226, in wrapper 
    fn(*args, **kwargs) 
    File "/Users/andres/.virtualenvs/[...]/lib/python2.7/site-packages/django/__init__.py", line 18, in setup 
    apps.populate(settings.INSTALLED_APPS) 
    File "/Users/andres/.virtualenvs/[...]/lib/python2.7/site-packages/django/apps/registry.py", line 85, in populate 
    app_config = AppConfig.create(entry) 
    File "/Users/andres/.virtualenvs/[...]/lib/python2.7/site-packages/django/apps/config.py", line 116, in create 
    mod = import_module(mod_path) 
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/__init__.py", line 37, in import_module 
    __import__(name) 
    File "/Users/andres/.virtualenvs/[...]/src/shopify-sync/shopify_sync/apps.py", line 2, in <module> 
    from shopify_sync.handlers import webhook_received_handler 
    File "/Users/andres/.virtualenvs/[...]/src/shopify-sync/shopify_sync/handlers.py", line 3, in <module> 
    from .models import (CustomCollection, Customer, Order, Product, Shop, 
    File "/Users/andres/.virtualenvs/[...]/src/shopify-sync/shopify_sync/models/__init__.py", line 3, in <module> 
    from .address import Address 
    File "/Users/andres/.virtualenvs/[...]/src/shopify-sync/shopify_sync/models/address.py", line 6, in <module> 
    from .base import ShopifyResourceModel 
    File "/Users/andres/.virtualenvs/[...]/src/shopify-sync/shopify_sync/models/base.py", line 144, in <module> 
    class ShopifyResourceModel(models.Model): 
    File "/Users/andres/.virtualenvs/[...]/lib/python2.7/site-packages/django/db/models/base.py", line 94, in __new__ 
    app_config = apps.get_containing_app_config(module) 
    File "/Users/andres/.virtualenvs/[...]/lib/python2.7/site-packages/django/apps/registry.py", line 239, in get_containing_app_config 
    self.check_apps_ready() 
    File "/Users/andres/.virtualenvs/[...]/lib/python2.7/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. 

UPDATE: Wenn ich die folgenden Zeilen (Modell Importe) https://github.com/andresdouglas/django-shopify-sync/blob/master/shopify_sync/handlers.py#L3-L4 nach innen get_topic_models bewegen scheint es, um den Fehler zu beheben. Aber das ist irgendwie schmutzig, kann jemand eine bessere Lösung finden?

Answer 1

Es sieht so aus, als könnten Sie ein Bestellproblem haben. Stellen Sie sicher, dass sich Ihre Anwendung im INSTALLED_APPS Tupel nach django-shopify-sync befindet. Sie können ein paar weitere Details in der Application registry documentation finden.

So unbefriedigend wie ein Inline-Import ist, können Sie damit festgefahren sein. Ich würde vorschlagen,

from shopify_sync.handlers import webhook_received_handler 
from shopify_webhook.signals import webhook_received 

in die ready Methode in apps.py bewegen. Dies verzögert den Import, bis die Modelle fertig sind.

Die Veränderung, die ich versuchte, ist:

diff --git a/shopify_sync/apps.py b/shopify_sync/apps.py 
index 663b43b..0bc1fcc 100644 
--- a/shopify_sync/apps.py 
+++ b/shopify_sync/apps.py 
@@ -1,7 +1,5 @@ 
from django.apps import AppConfig 
-from shopify_sync.handlers import webhook_received_handler 
-from shopify_webhook.signals import webhook_received 
- 
+import importlib 

class ShopifySyncConfig(AppConfig): 
    """ 
@@ -16,5 +14,9 @@ class ShopifySyncConfig(AppConfig): 
     The ready() method is called after Django setup. 
     """ 

+  signals_webhook_received = importlib.import_module('.signals', package='shopify_webhook') 
+  handlers_webhook_received_handler = importlib.import_module('.handlers', package='shopify_sync') 
+ 
     # Connect shopify_webhook's webhook_received signal to our synchronisation handler. 
-  webhook_received.connect(webhook_received_handler, dispatch_uid = 'shopify_sync_webhook_received_handler') 
+  signals_webhook_received.webhook_received.connect(handlers_webhook_received_handler.webhook_received_handler, dispatch_uid = 'shopify_sync_webhook_received_handler') 
+ 

Answer 2

Wenn Sie die folgenden Zeilen (Modell Importe) bewegen https://github.com/andresdouglas/django-shopify-sync/blob/master/shopify_sync/handlers.py#L3-L4

from .models import (CustomCollection, Customer, Order, Product, Shop, 
       SmartCollection) 

innerhalb get_topic_models scheint es, um den Fehler zu beheben. Aber das ist irgendwie schmutzig, kann jemand eine bessere Lösung finden?