Django model “doesn't declare an explicit app_label”

Question

I\'m at wit\'s end. After a dozen hours of troubleshooting, probably more, I thought I was finally in business, but then I got:

Model class django.contrib.co         


        

Answer 1

as a noob using Python3 ,I find it might be an import error instead of a Django error

wrong:

from someModule import someClass

right:

from .someModule import someClass

this happens a few days ago but I really can't reproduce it...I think only people new to Django may encounter this.here's what I remember:

try to register a model in admin.py:

from django.contrib import admin
from user import User
admin.site.register(User)

try to run server, error looks like this

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

change user to .user ,problem solved

Answer 2

For PyCharm users: I had an error using not "clean" project structure.

Was:

project_root_directory
└── src
    ├── chat
    │   ├── migrations
    │   └── templates
    ├── django_channels
    └── templates

Now:

project_root_directory
├── chat
│   ├── migrations
│   └── templates
│       └── chat
├── django_channels
└── templates

Here is a lot of good solutions, but I think, first of all, you should clean your project structure or tune PyCharm Django settings before setting DJANGO_SETTINGS_MODULE variables and so on.

Hope it'll help someone. Cheers.

Answer 3

I've got a similar error while building an API in Django rest_framework.

RuntimeError: Model class apps.core.models.University doesn't declare an explicit > app_label and isn't in an application in INSTALLED_APPS.

luke_aus's answer helped me by correcting my urls.py

from

from project.apps.views import SurgeryView

to

from apps.views import SurgeryView

Answer 4

After keep on running into this issue and keep on coming back to this question I thought I'd share what my problem was.

Everything that @Xeberdee is correct so follow that and see if that solves the issue, if not this was my issue:

In my apps.py this is what I had:

class AlgoExplainedConfig(AppConfig):
    name = 'algo_explained'
    verbose_name = "Explain_Algo"
    ....

And all I did was I added the project name in front of my app name like this:

class AlgoExplainedConfig(AppConfig):
name = '**algorithms_explained**.algo_explained'
verbose_name = "Explain_Algo"

and that solved my problem and I was able to run the makemigrations and migrate command after that! good luck

Answer 5

I got this error while trying to upgrade my Django Rest Framework app to DRF 3.6.3 and Django 1.11.1.

For anyone else in this situation, I found my solution in a GitHub issue, which was to unset the UNAUTHENTICATED_USER setting in the DRF settings:

# webapp/settings.py
...
REST_FRAMEWORK = {
    ...
    'UNAUTHENTICATED_USER': None
    ...
}

Answer 6

Most probably you have dependent imports.

In my case I used a serializer class as a parameter in my model, and the serializer class was using this model: serializer_class = AccountSerializer

from ..api.serializers import AccountSerializer

class Account(AbstractBaseUser):
    serializer_class = AccountSerializer
    ...

And in the "serializers" file:

from ..models import Account

class AccountSerializer(serializers.ModelSerializer):
    class Meta:
        model = Account
        fields = (
            'id', 'email', 'date_created', 'date_modified',
            'firstname', 'lastname', 'password', 'confirm_password')
    ...