Django模型“没有显式声明app_label”

我真是一筹莫及。经过十几个小时的故障排除，可能更多，我以为我终于可以做生意了，但接着我发现:

Model class django.contrib.contenttypes.models.ContentType doesn't declare an explicit app_label

网上关于这方面的信息太少了，没有解决方案可以解决我的问题。任何建议都将不胜感激。

我使用的是Python 3.4和Django 1.10。

从我的settings.py:

INSTALLED_APPS = [
    'DeleteNote.apps.DeletenoteConfig',
    'LibrarySync.apps.LibrarysyncConfig',
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
]

我的app .py文件是这样的:

from django.apps import AppConfig


class DeletenoteConfig(AppConfig):
    name = 'DeleteNote'

and

from django.apps import AppConfig


class LibrarysyncConfig(AppConfig):
    name = 'LibrarySync'

当前回答

在我的情况下，当我试图运行python manage.py runserver时，没有连接到我的项目的虚拟环境时，我得到了这个错误。

2020-10-26 14:20:43

其他回答

我刚才也遇到了同样的问题。我已经通过在应用程序名称上添加一个名称空间来修复我的。希望有人觉得这有帮助。

apps.py

from django.apps import AppConfig    

class SalesClientConfig(AppConfig):
        name = 'portal.sales_client'
        verbose_name = 'Sales Client'

2018-02-14 08:17:41

我在使用。/manage.py shell时得到了这个然后我不小心从根项目级目录导入

# don't do this
from project.someapp.someModule import something_using_a_model
# do this
from someapp.someModule import something_using_a_model

something_using_a_model()

2017-08-22 04:38:04

在我的情况下，当我试图运行python manage.py runserver时，没有连接到我的项目的虚拟环境时，我得到了这个错误。

2020-10-26 14:20:43

我只是遇到了这个问题，并找出了哪里出了问题。由于之前的回答没有描述这个问题发生在我身上，我想我可以把它发布给其他人:

the issue came from using python migrate.py startapp myApp from my project root folder, then move myApp to a child folder with mv myApp myFolderWithApps/. I wrote myApp.models and ran python migrate.py makemigrations. All went well. then I did the same with another app that was importing models from myApp. Kaboom! I ran into this error, while performing makemigrations. That was because I had to use myFolderWithApps.myApp to reference my app, but I had forgotten to update MyApp/apps.py. So I corrected myApp/apps.py, settings/INSTALLED_APPS and my import path in my second app. but then the error kept happening: the reason was that I had migrations trying to import the models from myApp with the wrong path. I tried to correct the migration file, but I went at the point where it was easier to reset the DB and delete the migrations to start from scratch.

长话短说: -这个问题最初是来自myApp的apps.py中的应用程序名称错误，在设置和我的第二个应用程序的导入路径。 -但仅仅纠正这三个地方的路径是不够的，因为导入时引用了错误的应用程序名称。因此，同样的错误在迁移过程中不断发生(除了这次是从迁移中)。

所以…检查您的迁移，祝您好运!

2018-03-15 22:58:46

在我的例子中，在settings.py中的BASE_DIR有一个问题。这是包的结构:

project_root_directory
└── service_package
    └── db_package
        ├── my_django_package
        │       └── my_django_package
        │          ├── settings.py
        │          └── ...
        └── my_django_app
               ├── migrations
               ├── models.py
               └── ...

它在更新settings.py时工作:

INSTALLED_APPS = [
    'some_django_stuff_here...',
    'some_django_stuff_here....',
    ...
    'service_package.db_package.my_django_app'
]

BASE_DIR指向项目根目录

BASE_DIR = Path(__file__).resolve().parent.parent.parent.parent.parent

在调试中运行django，在registry.py中使用断点-> def get_containing_app_config(self, object_name)

2020-12-31 07:44:07

Django模型“没有显式声明app_label”

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