如何在Django 1.7中解决“ django.core.exceptions.ImproperlyConfigured：应用程序标签不唯一，重复：foo”的问题？

Question

在升级到Django 1.7时，我收到以下错误消息 ./manage.py

$ ./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

有什么问题，我该如何解决？

Answer 1

问题在于，随着Django 1.7中应用程序的更改，要求应用程序具有唯一标签。

默认情况下，应用程序标签为程序包名称，因此，如果你具有与你的应用程序模块之一相同名称的程序包（foo在本例中），则会遇到此错误。

解决方案是覆盖应用程序的默认标签，并通过将其添加到来强制加载此配置__init__.py。

# 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'