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!
我在测试中导入模型时遇到了这个错误，即给出这个Django项目结构:
|-- myproject
|-- manage.py
|-- myproject
|-- myapp
|-- models.py # defines model: MyModel
|-- tests
|-- test_models.py
在文件test_models.py中导入MyModel:
from models import MyModel
如果以这种方式导入，问题就解决了:
from myapp.models import MyModel
希望这能有所帮助!
PS:也许这有点晚了，但我在其他人的答案中没有发现如何解决我的代码中的这个问题，我想分享我的解决方案。
很可能您有依赖的导入。
在我的例子中，我在我的模型中使用了一个序列化器类作为参数，并且序列化器类使用了这个模型:
serializer_class = AccountSerializer
from ..api.serializers import AccountSerializer
class Account(AbstractBaseUser):
serializer_class = AccountSerializer
...
在“serializers”文件中:
from ..models import Account
class AccountSerializer(serializers.ModelSerializer):
class Meta:
model = Account
fields = (
'id', 'email', 'date_created', 'date_modified',
'firstname', 'lastname', 'password', 'confirm_password')
...
