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'
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!
我今天试图运行Django测试时出现了这个错误，因为我在其中一个文件中使用了.models import *语法的简写。问题是我的文件结构是这样的:
apps/
myapp/
models/
__init__.py
foo.py
bar.py
在models/__init__.py中，我使用简写语法导入我的模型:
from .foo import *
from .bar import *
在我的应用程序中，我像这样导入模型:
from myapp.models import Foo, Bar
这导致Django模型在运行./manage.py测试时没有显式声明app_label。
为了解决这个问题，我必须显式地从models/__init__.py中的完整路径导入:
from myapp.models.foo import *
from myapp.models.bar import *
这就解决了错误。
H - t https://medium.com/@michal。博克fix-weird-exceptions-when-running-django-tests-f58def71b59a
作为一个使用Python3的新手，我发现这可能是一个导入错误而不是Django错误
错误的:
from someModule import someClass
正确的:
from .someModule import someClass
这发生在几天前，但我真的无法重现它…我认为只有刚接触Django的人才会遇到这种情况。以下是我所记得的:
尝试在admin.py中注册一个模型:
from django.contrib import admin
from user import User
admin.site.register(User)
尝试运行服务器，错误如下所示
some lines...
File "/path/to/admin.py" ,line 6
tell you there is an import error
some lines...
Model class django.contrib.contenttypes.models.ContentType doesn't declare an explicit app_label
将user改为.user，问题就解决了
