Django 1.9：我应该避免在“django.setup()”期间导入模型吗？

Question

将我的应用程序移植到 django 1.9，我得到了可怕的 django.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet

基本上我的堆栈跟踪是：

  manage.py
    execute_from_command_line(sys.argv)
  django/core/management:352, in execute_from_command_line
    utility.execute()
  django/core/management/__init__.py:326, in execute
    django.setup()
  django/__init__.py:18, in setup
    apps.populate(settings.INSTALLED_APPS)
  django/apps/registry.py:85, in populate
    app_config = AppConfig.create(entry)
  django/apps/config.py:90, in create
    module = import_module(entry)
  python2.7/importlib/__init__.py:37, in import_module
    __import__(name)
  myapp/mylib/__init__.py:52, in <module>
    from django.contrib.contenttypes.models import ContentType   #<= The important part
  django/contrib/contenttypes/models.py:159, in <module>
    class ContentType(models.Model):
  django/db/models/base.py:94, in __new__
    app_config = apps.get_containing_app_config(module)
  django/apps/registry.p:239, in get_containing_app_config
    self.check_apps_ready()
  django/apps/registry.py:124, in check_apps_ready
    raise AppRegistryNotReady("Apps aren't loaded yet.")
django.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet.

我的主要问题是：

我应该在我的 Django 应用程序的 __init__.py 中导入我的模型吗？

它似乎触发了 django.models.ModelBase 元类，该元类在创建模型之前检查应用程序是否准备就绪。

Answer 1

Should I import my models in the __init__.py of my django apps ?

不，您不得不在任何已安装应用程序的 __init__.py 文件中导入任何模型。这在 1.9 中不再可能。

来自release notes：

All models need to be defined inside an installed application or declare an explicit app_label. Furthermore, it isn’t possible to import them before their application is loaded. In particular, it isn’t possible to import models inside the root package of an application.

Django 1.9：我应该避免在“django.setup()”期间导入模型吗？

Django 1.9: Should I avoid importing models during `django.setup()`?

python

django

django-models

django-1.9