django - 如何解决 "django.core.exceptions.ImproperlyConfigured: Application labels aren' t unique, duplicates : foo"in Django 1. 7?

Question

在升级到 Django 1.7 时，我从 ./manage.py 收到以下错误消息

$ ./manage.py 
Traceback (most recent call last):
  File "./manage.py", line 16, in <module>
    execute_from_command_line(sys.argv)
  File "/home/johnc/.virtualenvs/myproj-django1.7/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 427, in execute_from_command_line
    utility.execute()
  File "/home/johnc/.virtualenvs/myproj-django1.7/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 391, in execute
    django.setup()
  File "/home/johnc/.virtualenvs/myproj-django1.7/local/lib/python2.7/site-packages/django/__init__.py", line 21, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/home/johnc/.virtualenvs/myproj-django1.7/local/lib/python2.7/site-packages/django/apps/registry.py", line 89, in populate
    "duplicates: %s" % app_config.label)
django.core.exceptions.ImproperlyConfigured: Application labels aren't unique, duplicates: foo

问题是什么，我该如何解决？

Answer 1

问题在于，随着 Django 1.7 中对应用程序的更改，应用程序需要具有唯一标签。

默认情况下，应用标签是包名，所以如果你有一个与你的应用模块(在本例中为 foo)同名的包，你会点击这个错误。

解决方案是覆盖您应用的默认标签，并通过将其添加到 __init__.py 来强制加载此配置。

# foo/apps.py

from django.apps import AppConfig

class FooConfig(AppConfig):
    name = 'full.python.path.to.your.app.foo'
    label = 'my.foo'  # <-- this is the important line - change it to anything other than the default, which is the module name ('foo' in this case)

和

# foo/__init__.py

default_app_config = 'full.python.path.to.your.app.foo.apps.FooConfig'

参见 https://docs.djangoproject.com/en/1.7/ref/applications/#for-application-authors