migrations don't work

[somen...@gmail.com]

Hi,

makemigrations works but migrate does not:

[xan@mercuri gargamella]$ python manage.py makemigrations
Migrations for 'quedar':
  0003_auto_20150322_1813.py:
    - Create model Persona
    - Delete model User
    - Add field user to persona
    - Alter field members on dialectgroup
    - Alter field members on languagelevelgroup
    - Alter field members on learninggroup
    - Alter field members on learningpeople
    - Alter field members on teachinggroup
[xan@mercuri gargamella]$ python manage.py migrate
Operations to perform:
  Apply all migrations: admin, auth, sessions, contenttypes, quedar
Running migrations:
  Applying quedar.0003_auto_20150322_1813...Traceback (most recent call last):
  File "/usr/lib/python3.4/site-packages/django/apps/config.py", line 163, in get_model
    return self.models[model_name.lower()]
KeyError: 'user'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.4/site-packages/django/db/migrations/state.py", line 84, in render
    model = self.apps.get_model(lookup_model[0], lookup_model[1])
  File "/usr/lib/python3.4/site-packages/django/apps/registry.py", line 202, in get_model
    return self.get_app_config(app_label).get_model(model_name.lower())
  File "/usr/lib/python3.4/site-packages/django/apps/config.py", line 166, in get_model
    "App '%s' doesn't have a '%s' model." % (self.label, model_name))
LookupError: App 'quedar' doesn't have a 'user' model.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/usr/lib/python3.4/site-packages/django/core/management/__init__.py", line 385, in execute_from_command_line
    utility.execute()
  File "/usr/lib/python3.4/site-packages/django/core/management/__init__.py", line 377, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/lib/python3.4/site-packages/django/core/management/base.py", line 288, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/usr/lib/python3.4/site-packages/django/core/management/base.py", line 338, in execute
    output = self.handle(*args, **options)
  File "/usr/lib/python3.4/site-packages/django/core/management/commands/migrate.py", line 161, in handle
    executor.migrate(targets, plan, fake=options.get("fake", False))
  File "/usr/lib/python3.4/site-packages/django/db/migrations/executor.py", line 68, in migrate
    self.apply_migration(migration, fake=fake)
  File "/usr/lib/python3.4/site-packages/django/db/migrations/executor.py", line 102, in apply_migration
    migration.apply(project_state, schema_editor)
  File "/usr/lib/python3.4/site-packages/django/db/migrations/migration.py", line 108, in apply
    operation.database_forwards(self.app_label, schema_editor, project_state, new_state)
  File "/usr/lib/python3.4/site-packages/django/db/migrations/operations/fields.py", line 29, in database_forwards
    to_model = to_state.render().get_model(app_label, self.model_name)
  File "/usr/lib/python3.4/site-packages/django/db/migrations/state.py", line 94, in render
    raise ValueError(msg.format(field=operations[0][1], model=lookup_model))
ValueError: Lookup failed for model referenced by field quedar.LearningGroup.members: quedar.User
[xan@mercuri gargamella]$

Any hints?

[Vijay Khemlani]

Judging from the makemigrations output, you deleted a model (User) but also added it as a foreignkey field to another model (Persona), is that what you wanted?

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[Markus Holtermann]

Hi,

from the information you provided I can only guess you are migrating away from a custom user model to the "normal" Django user model. This won't work (out of the box). And even the way to migrate from the Django user model to a custom user model is more of a workaround than a solution. Please see https://docs.djangoproject.com/en/dev/topics/auth/customizing/#substituting-a-custom-user-model for details.

/Markus

[James Schneider]

I think the end of the traceback is pretty telling:

ValueError: Lookup failed for model referenced by field quedar.LearningGroup.members: quedar.User

You have a LearningGroup model with an attribute called members which is still referencing the original User model that was removed.

-James

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