Hello,
I have created a new model called Settings, which has a OneToOneField(User,
primary_key=True) field. After the automatically created
migrations.CreateModel() invocation I added a RunPython line that runs this
function:
def create_user_settings(apps, schema_editor):
User = get_user_model()
Settings = apps.get_model('accounts', 'Settings')
for user in User.objects.all():
Settings.objects.get_or_create(user=user) # This is line 13
When running this migration, I get the following error:
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File
"/home/polesz/Projects/dem/venv/lib/python2.7/site-packages/django/core/management/__init__.py",
line 338, in execute_from_command_line
utility.execute()
File
"/home/polesz/Projects/dem/venv/lib/python2.7/site-packages/django/core/management/__init__.py",
line 330, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File
"/home/polesz/Projects/dem/venv/lib/python2.7/site-packages/django/core/management/base.py",
line 390, in run_from_argv
self.execute(*args, **cmd_options)
File
"/home/polesz/Projects/dem/venv/lib/python2.7/site-packages/django/core/management/base.py",
line 441, in execute
output = self.handle(*args, **options)
File
"/home/polesz/Projects/dem/venv/lib/python2.7/site-packages/django/core/management/commands/migrate.py",
line 221, in handle
executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial)
File
"/home/polesz/Projects/dem/venv/lib/python2.7/site-packages/django/db/migrations/executor.py",
line 110, in migrate
self.apply_migration(states[migration], migration, fake=fake,
fake_initial=fake_initial)
File
"/home/polesz/Projects/dem/venv/lib/python2.7/site-packages/django/db/migrations/executor.py",
line 147, in apply_migration
state = migration.apply(state, schema_editor)
File
"/home/polesz/Projects/dem/venv/lib/python2.7/site-packages/django/db/migrations/migration.py",
line 115, in apply
operation.database_forwards(self.app_label, schema_editor, old_state,
project_state)
File
"/home/polesz/Projects/dem/venv/lib/python2.7/site-packages/django/db/migrations/operations/special.py",
line 183, in database_forwards
self.code(from_state.apps, schema_editor)
File "/home/polesz/Projects/dem/accounts/migrations/0003_settings.py",
line 13, in create_user_settings
Settings.objects.get_or_create(user=user)
File
"/home/polesz/Projects/dem/venv/lib/python2.7/site-packages/django/db/models/manager.py",
line 127, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File
"/home/polesz/Projects/dem/venv/lib/python2.7/site-packages/django/db/models/query.py",
line 405, in get_or_create
return self.get(**lookup), False
File
"/home/polesz/Projects/dem/venv/lib/python2.7/site-packages/django/db/models/query.py",
line 325, in get
clone = self.filter(*args, **kwargs)
File
"/home/polesz/Projects/dem/venv/lib/python2.7/site-packages/django/db/models/query.py",
line 679, in filter
return self._filter_or_exclude(False, *args, **kwargs)
File
"/home/polesz/Projects/dem/venv/lib/python2.7/site-packages/django/db/models/query.py",
line 697, in _filter_or_exclude
clone.query.add_q(Q(*args, **kwargs))
File
"/home/polesz/Projects/dem/venv/lib/python2.7/site-packages/django/db/models/sql/query.py",
line 1306, in add_q
clause, require_inner = self._add_q(where_part, self.used_aliases)
File
"/home/polesz/Projects/dem/venv/lib/python2.7/site-packages/django/db/models/sql/query.py",
line 1333, in _add_q
current_negated=current_negated, connector=connector,
allow_joins=allow_joins)
File
"/home/polesz/Projects/dem/venv/lib/python2.7/site-packages/django/db/models/sql/query.py",
line 1175, in build_filter
self.check_related_objects(field, value, opts)
File
"/home/polesz/Projects/dem/venv/lib/python2.7/site-packages/django/db/models/sql/query.py",
line 1070, in check_related_objects
self.check_query_object_type(value, opts)
File
"/home/polesz/Projects/dem/venv/lib/python2.7/site-packages/django/db/models/sql/query.py",
line 1054, in check_query_object_type
(value, opts.object_name))
ValueError: Cannot query "polesz": Must be "User" instance.
While debugging, it turns out that the value of the user variable is indeed
a User instance. Do I miss some key information here? Maybe apps are not
fully initialized when I run migrations?
Best,
Gergely
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