Monday, July 5, 2021

Related model 'company.user' cannot be resolved

I moved my custom user and userprofile models from my 'common' app into
my 'company' app by way of locking the model tables first (db_table =
"common_user" and so on) and just plain refactoring.

That has all worked sort of as expected in that Company and User models
now appear in the company app space in the Admin which was my original
motivation.

makemigrations wanted to destroy data with delete/create models in order
to move them and of course I couldn't let that happen. migrate --fake
and migrate --fake-initial wouldn't work due to lots of other models
looking for settings.AUTH_USER_MODEL which Django couldn't find in the
company app so I finessed my own fake migrations. That also seemed to
work and the job seemed done.

BUT manage.py test now fails with "Related model 'company.user' cannot
be resolved"

StackOverflow seems to indicate my finessed migrations are at fault. I
have tried to tweak the dependencies with no luck as follows ...

# company.migrations.0005_user_userprofile.py
...
    dependencies = [
        ('auth', '0012_alter_user_first_name_max_length'),
        ('company', '0004_auto_20210510_1431'),       # older pre move
migration
        ('common', '0008_auto_20210705_1740'),        # see below
    ]

    operations = [
        migrations.CreateModel(
            name='User',
            fields=[
                ('id', models.BigAutoField(auto_created=True,
primary_key=True, serialize=False, verbose_name='ID')),
                ('password', models.CharField(max_length=128,
verbose_name='password')),
... etc for creating both User and UserProfile models

# common.migrations.0008_auto_20210705_1740.py
...
    dependencies = [
        ('common', '0007_userprofile_job_title'),    # older pre-move
migration
    ]

    operations = [
        migrations.RemoveField(
            model_name='userprofile',
            name='company',
        ),
        migrations.RemoveField(
            model_name='userprofile',
            name='user',
        ),
        migrations.DeleteModel(
            name='User',
        ),
        migrations.DeleteModel(
            name='UserProfile',
        ),
    ]


Django 3.2.5, Python 3.8

I feel I should have zigged when I should've zagged. Thanks for any
suggestions

Mike

Traceback (most recent call last):
  File "manage.py", line 21, in <module>
    main()
  File "manage.py", line 17, in main
    execute_from_command_line(sys.argv)
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\core\management\__init__.py",
line 419, in execute_from_command_line
    utility.execute()
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\core\management\__init__.py",
line 413, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\core\management\commands\test.py",
line 23, in run_from_argv
    super().run_from_argv(argv)
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\core\management\base.py",
line 354, in run_from_argv
    self.execute(*args, **cmd_options)
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\core\management\base.py",
line 398, in execute
    output = self.handle(*args, **options)
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\core\management\commands\test.py",
line 55, in handle
    failures = test_runner.run_tests(test_labels)
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\test\runner.py", line
725, in run_tests
    old_config = self.setup_databases(aliases=databases)
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\test\runner.py", line
643, in setup_databases
    return _setup_databases(
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\test\utils.py", line
179, in setup_databases
    connection.creation.create_test_db(
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\db\backends\base\creation.py",
line 74, in create_test_db
    call_command(
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\core\management\__init__.py",
line 181, in call_command
    return command.execute(*args, **defaults)
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\core\management\base.py",
line 398, in execute
    output = self.handle(*args, **options)
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\core\management\base.py",
line 89, in wrapped
    res = handle_func(*args, **kwargs)
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\core\management\commands\migrate.py",
line 244, in handle
    post_migrate_state = executor.migrate(
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\db\migrations\executor.py",
line 117, in migrate
    state = self._migrate_all_forwards(state, plan, full_plan,
fake=fake, fake_initial=fake_initial)
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\db\migrations\executor.py",
line 147, in _migrate_all_forwards
    state = self.apply_migration(state, migration, fake=fake,
fake_initial=fake_initial)
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\db\migrations\executor.py",
line 227, in apply_migration
    state = migration.apply(state, schema_editor)
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\db\migrations\migration.py",
line 126, in apply
    operation.database_forwards(self.app_label, schema_editor,
old_state, project_state)
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\db\migrations\operations\models.py",
line 92, in database_forwards
    schema_editor.create_model(model)
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\db\backends\base\schema.py",
line 343, in create_model
    sql, params = self.table_sql(model)
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\db\backends\base\schema.py",
line 162, in table_sql
    definition, extra_params = self.column_sql(model, field)
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\db\backends\base\schema.py",
line 215, in column_sql
    db_params = field.db_parameters(connection=self.connection)
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\db\models\fields\related.py",
line 1004, in db_parameters
    return {"type": self.db_type(connection), "check":
self.db_check(connection)}
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\db\models\fields\related.py",
line 1001, in db_type
    return self.target_field.rel_db_type(connection=connection)
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\db\models\fields\related.py",
line 897, in target_field
    return self.foreign_related_fields[0]
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\utils\functional.py",
line 48, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\db\models\fields\related.py",
line 644, in foreign_related_fields
    return tuple(rhs_field for lhs_field, rhs_field in
self.related_fields if rhs_field)
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\utils\functional.py",
line 48, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\db\models\fields\related.py",
line 632, in related_fields
    return self.resolve_related_fields()
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\db\models\fields\related.py",
line 936, in resolve_related_fields
    related_fields = super().resolve_related_fields()
  File
"D:\Users\mike\envs\xxai\lib\site-packages\django\db\models\fields\related.py",
line 615, in resolve_related_fields
    raise ValueError('Related model %r cannot be resolved' %
self.remote_field.model)
ValueError: Related model 'company.user' cannot be resolved


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