CODEWITHSUNDEEP
pythondjango
bhsu
bhsu

Reputation: 402

Django "Dependency on unknown app" error even though the app folder exists

I'm trying to run manage.py runserver or manage.py makemigrations, but I'm getting an error when I do. The error is: ValueError: Dependency on unknown app: backend.

Here's the full error message:

Benjamins-MacBook-Pro:package-backend benhsu$ python3 manage.py makemigrations
Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/core/management/__init__.py", line 385, in execute_from_command_line
    utility.execute()
  File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/core/management/__init__.py", line 377, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/core/management/base.py", line 288, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/core/management/base.py", line 338, in execute
    output = self.handle(*args, **options)
  File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/core/management/commands/makemigrations.py", line 57, in handle
    loader = MigrationLoader(None, ignore_no_migrations=True)
  File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/migrations/loader.py", line 48, in __init__
    self.build_graph()
  File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/migrations/loader.py", line 243, in build_graph
    parent = self.check_key(parent, key[0])
  File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/django/db/migrations/loader.py", line 168, in check_key
    raise ValueError("Dependency on unknown app: %s" % key[0])
ValueError: Dependency on unknown app: backend

"backend" is the app I'm working on, and you can see in my folder that it exists. Here's my folder structure:

enter image description here

Here's the relevant part of my settings.py file:

# Application definition

AUTH_USER_MODEL = 'backend.User'

INSTALLED_APPS = (
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'rest_framework',
    'backend'
)

I don't understand why it's not working since the backend app exists in my folder.

I'd appreciate any help!

Upvotes: 4

Views: 3953

Answers (2)

ryanjdillon
ryanjdillon

Reputation: 18948

I ran into this same error with a custom user app.

I deleted:

  • all migrations folders
  • all *.pyc files
  • all __pycach__ directories
  • my sql lite db

then I ran

python manage.py syncdb

And that did the trick

Upvotes: 1

itzMEonTV
itzMEonTV

Reputation: 20339

Did you trying to use custom User model since AUTH_USER_MODEL = 'backend.User' ?

So You have to try like this.

 ./manage.py makemigrations backend

From https://docs.djangoproject.com/en/1.7/topics/migrations/#s-custom-fields

Upvotes: 3

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