Re: 'migrate' triggers lazy reference error when changing custom user model name

Hello!

I'm having the same problem right now. Have you found any solution? That would be very helpful to me.

Thank you.

On Wednesday, December 7, 2016 at 5:18:55 PM UTC+5, Johan Cockx wrote:

I am running  Django 1.10.4 with Python 3.4.3, learning about Django.

I created a custom user model 'MyUser' copied from the Django docs at https://docs.djangoproject.com/en/1.10/topics/auth/customizing/#substituting-a-custom-user-model;  this works fine.

Then I renamed the model from 'MyUser' to 'TheUser', updating models.py, admin.py and settings.py and succesfully ran 'makemigrations'.  Then,  when I run 'migrate',  I get the traceback below.

If I temporarily comment the AUTH_USER_MODEL setting, makemigrations works fine, but as soon as I uncomment the AUTH_USER_MODEL setting again,  both 'makemigrations' and 'migrate' fail with the same error and a similar traceback.

I did not do any additional changes to the model, so makemigrations and migrate should actually not do anything at this point.

Is this a bug?

I have attached a complete project that can be used to reproduce the problem.

$ python manage.py makemigrations

Did you rename the auth_by_email.MyUser model to TheUser? [y/N] y

Migrations for 'admin':

  /home/johan/Seafile/main/sikando/Projects/doclr/env/lib/python3.4/site-packages/django/contrib/admin/migrations/0003_auto_20161207_1018.py:

    - Alter field user on logentry

Migrations for 'auth_by_email':

  auth_by_email/migrations/0003_auto_20161207_1018.py:

    - Rename model MyUser to TheUser

$ python manage.py migrate

Operations to perform:

  Apply all migrations: admin, auth, auth_by_email, contenttypes, sessions

Traceback (most recent call last):

  File "/home/johan/work/backend/manage.py", line 22, in <module>

    execute_from_command_line(sys.argv)

  File "/home/johan/Seafile/main/sikando/Projects/doclr/env/lib/python3.4/site-packages/django/core/management/__init__.py", line 367, in execute_from_command_line

    utility.execute()

  File "/home/johan/Seafile/main/sikando/Projects/doclr/env/lib/python3.4/site-packages/django/core/management/__init__.py", line 359, in execute

    self.fetch_command(subcommand).run_from_argv(self.argv)

  File "/home/johan/Seafile/main/sikando/Projects/doclr/env/lib/python3.4/site-packages/django/core/management/base.py", line 294, in run_from_argv

    self.execute(*args, **cmd_options)

  File "/home/johan/Seafile/main/sikando/Projects/doclr/env/lib/python3.4/site-packages/django/core/management/base.py", line 345, in execute

    output = self.handle(*args, **options)

  File "/home/johan/Seafile/main/sikando/Projects/doclr/env/lib/python3.4/site-packages/django/core/management/commands/migrate.py", line 164, in handle

    pre_migrate_apps = pre_migrate_state.apps

  File "/home/johan/Seafile/main/sikando/Projects/doclr/env/lib/python3.4/site-packages/django/utils/functional.py", line 35, in __get__

    res = instance.__dict__[self.name] = self.func(instance)

  File "/home/johan/Seafile/main/sikando/Projects/doclr/env/lib/python3.4/site-packages/django/db/migrations/state.py", line 176, in apps

    return StateApps(self.real_apps, self.models)

  File "/home/johan/Seafile/main/sikando/Projects/doclr/env/lib/python3.4/site-packages/django/db/migrations/state.py", line 249, in __init__

    raise ValueError("\n".join(error.msg for error in errors))

ValueError: The field admin.LogEntry.user was declared with a lazy reference to 'auth_by_email.theuser', but app 'auth_by_email' doesn't provide model 'theuser'.

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