Django 1.7 应用程序标签不是唯一的，重复 foo答案

【问题标题】：Django 1.7 Application labels aren't unique, duplicates fooDjango 1.7 应用程序标签不是唯一的，重复 foo
【发布时间】：2015-01-29 18:37:40
【问题描述】：

在特定部署中，我遇到了 Django 1.7 与新应用注册表有关的问题。通常我会炸掉实例并重新创建它，但是当我销毁实例时它会继续发生。

导致此错误的始终是产品应用程序，我使用 app.py 文件将标签更改为 sc_products，但现在 sc_products 也已定义。

在这个特定示例中，我尝试迁移应用程序。

Running migrations:
  Applying sc_products.0001_initial...Traceback (most recent call last):
  File "manage.py", line 9, in <module>
    execute_from_command_line(sys.argv)
  File "/home/savingschampion/.virtualenvs/savings_champion/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 385, in execute_from_command_line
    utility.execute()
  File "/home/savingschampion/.virtualenvs/savings_champion/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 377, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/savingschampion/.virtualenvs/savings_champion/local/lib/python2.7/site-packages/django/core/management/base.py", line 288, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/home/savingschampion/.virtualenvs/savings_champion/local/lib/python2.7/site-packages/django/core/management/base.py", line 338, in execute
    output = self.handle(*args, **options)
  File "/home/savingschampion/.virtualenvs/savings_champion/local/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 160, in handle
    executor.migrate(targets, plan, fake=options.get("fake", False))
  File "/home/savingschampion/.virtualenvs/savings_champion/local/lib/python2.7/site-packages/django/db/migrations/executor.py", line 63, in migrate
    self.apply_migration(migration, fake=fake)
  File "/home/savingschampion/.virtualenvs/savings_champion/local/lib/python2.7/site-packages/django/db/migrations/executor.py", line 91, in apply_migration
    if self.detect_soft_applied(migration):
  File "/home/savingschampion/.virtualenvs/savings_champion/local/lib/python2.7/site-packages/django/db/migrations/executor.py", line 135, in detect_soft_applied
    apps = project_state.render()
  File "/home/savingschampion/.virtualenvs/savings_champion/local/lib/python2.7/site-packages/django/db/migrations/state.py", line 57, in render
    self.apps = Apps([AppConfigStub(label) for label in sorted(self.real_apps + list(app_labels))])
  File "/home/savingschampion/.virtualenvs/savings_champion/local/lib/python2.7/site-packages/django/apps/registry.py", line 56, in __init__
    self.populate(installed_apps)
  File "/home/savingschampion/.virtualenvs/savings_champion/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: sc_products

我已经从那里做以下回答：

How to resolve "django.core.exceptions.ImproperlyConfigured: Application labels aren't unique, duplicates: foo" in Django 1.7?

【问题讨论】：

标签： python django django-1.7

【解决方案1】：

检查您的 INSTALLED_APPS。我不小心将同一个应用列出了两次，并且出现了类似的错误。

【讨论】：

【解决方案2】：

我遇到了同样的问题，只是偶然发现了这个问题。在调试了 django 一段时间后，我可能已经为您提供了期待已久的答案。

这很可能是因为您的应用最终同时被视为未迁移和已迁移（因此即使您更改了应用标签也会产生相同的错误），而这反过来又是因为您的应用同时具有旧版本-style（南）迁移和新式（django）迁移。

解决这个问题的最佳和最简单的方法是重新开始。删除所有编号的迁移（例如rm migrations/0???_*.py*）并重新调用manage.py makemigrations，确保只留下 django 迁移并且是最新的。

【讨论】：