django中的自定义用户引发了ValueError

Question

Even this simple example throws a ValueError: Dependency on app with no migrations: myApp during python manage.py syncdb

myApp/models.py

from django.contrib.auth.models import AbstractUser

class User(AbstractUser):
    pass

settings.py

AUTH_USER_MODEL = 'myApp.User'

---

Running ./manage syncdb in django==1.6.5 << works

Creating tables ...

Running ./manage syncdb in django==1.7 << breaks

Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/Users/bdhammel/Documents/web_development/tutorials/python_social_auth/env/lib/python2.7/site-packages/django/core/management/__init__.py", line 385, in execute_from_command_line
    utility.execute()
  File "/Users/bdhammel/Documents/web_development/tutorials/python_social_auth/env/lib/python2.7/site-packages/django/core/management/__init__.py", line 377, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Users/bdhammel/Documents/web_development/tutorials/python_social_auth/env/lib/python2.7/site-packages/django/core/management/base.py", line 288, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/Users/bdhammel/Documents/web_development/tutorials/python_social_auth/env/lib/python2.7/site-packages/django/core/management/base.py", line 338, in execute
    output = self.handle(*args, **options)
  File "/Users/bdhammel/Documents/web_development/tutorials/python_social_auth/env/lib/python2.7/site-packages/django/core/management/base.py", line 533, in handle
    return self.handle_noargs(**options)
  File "/Users/bdhammel/Documents/web_development/tutorials/python_social_auth/env/lib/python2.7/site-packages/django/core/management/commands/syncdb.py", line 27, in handle_noargs
    call_command("migrate", **options)
  File "/Users/bdhammel/Documents/web_development/tutorials/python_social_auth/env/lib/python2.7/site-packages/django/core/management/__init__.py", line 115, in call_command
    return klass.execute(*args, **defaults)
  File "/Users/bdhammel/Documents/web_development/tutorials/python_social_auth/env/lib/python2.7/site-packages/django/core/management/base.py", line 338, in execute
    output = self.handle(*args, **options)
  File "/Users/bdhammel/Documents/web_development/tutorials/python_social_auth/env/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 63, in handle
    executor = MigrationExecutor(connection, self.migration_progress_callback)
  File "/Users/bdhammel/Documents/web_development/tutorials/python_social_auth/env/lib/python2.7/site-packages/django/db/migrations/executor.py", line 17, in __init__
    self.loader = MigrationLoader(self.connection)
  File "/Users/bdhammel/Documents/web_development/tutorials/python_social_auth/env/lib/python2.7/site-packages/django/db/migrations/loader.py", line 48, in __init__
    self.build_graph()
  File "/Users/bdhammel/Documents/web_development/tutorials/python_social_auth/env/lib/python2.7/site-packages/django/db/migrations/loader.py", line 239, in build_graph
    parent = self.check_key(parent, key[0])
  File "/Users/bdhammel/Documents/web_development/tutorials/python_social_auth/env/lib/python2.7/site-packages/django/db/migrations/loader.py", line 163, in check_key
    raise ValueError("Dependency on app with no migrations: %s" % key[0])
ValueError: Dependency on app with no migrations: myApp

I haven't been able to find anything in the documentation for 1.7 that says this should be done any differently that 1.6. It does look like some other people have had this problem too , but as a result from running ./manage.py migrate --list

Has anyone encountered this?

Answer 1

I guess I was looking in the wrong place for an answer:

I solved this by running: ./manage.py makemigrations myApp

(env)Bens-MacBook-Pro:social_auth bdhammel$ ./manage.py makemigrations myApp
Migrations for 'myApp':
  0001_initial.py:
    - Create model User
(env)Bens-MacBook-Pro:social_auth bdhammel$ python manage.py syncdb
Operations to perform:
  Apply all migrations: sessions, admin, myApp, auth, default, contenttypes
Running migrations:
  Applying contenttypes.0001_initial... FAKED
  Applying auth.0001_initial... FAKED
  Applying app.0001_initial... FAKED
  Applying admin.0001_initial... FAKED
  Applying default.0001_initial... FAKED
  Applying sessions.0001_initial... FAKED

You have installed Django's auth system, and don't have any superusers defined.
Would you like to create one now? (yes/no): yes

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

EDIT
I should have used python manage.py migrate instead of python manage.py syncdb .

https://docs.djangoproject.com/en/1.8/releases/1.7/#schema-migrations

syncdb has been deprecated and replaced by migrate. Don't worry - calls to syncdb will still work as before.

Answer 2

1. Delete migrations folder in each app
2. Drop table django_migrations
3. Run python3 manage.py makemigrations app1
4. Run python3 manage.py makemigrations app2

---

manage.py runserver should now work like a charm

Answer 3

This happened to me when I moved an app into a clean new project without deleting the migrations. If you don't care about the migrations and are starting a project from scratch, consider removing the migrations from those apps.