Migrations on app named 'settings' fails when callable default on a field present

[Louis Lang]

This seems to be a trivial issue that is reasonably resolved by simply renaming the settings application (an app that I created). However, given that the migrations file (snippet below) was generated by Django and the imports clobber one another it seems reasonable enough consider this a bug.

# -*- coding: utf-8 -*-
# Generated by Django 1.9.7 on 2016-06-17 03:12
from __future__ import unicode_literals
 
from django.conf import settings
from django.db import migrations, models
import django.db.models.deletion
import settings.models

Here is the callable on the field:

('preview_image', models.ImageField(upload_to=settings.models.get_preview_path)),

And the full migration, just in case:

class Migration(migrations.Migration):
 
    initial = True
 
    dependencies = [
        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
    ]
 
    operations = [
        migrations.CreateModel(
            name='Setting',
            fields=[
                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                ('name', models.CharField(blank=True, max_length=250, null=True)),
                ('email', models.EmailField(blank=True, max_length=254, null=True)),
                ('phone', models.CharField(blank=True, max_length=20, null=True)),
                ('url', models.URLField(blank=True, null=True)),
                ('paypal_email', models.EmailField(blank=True, max_length=254, null=True)),
            ],
        ),
        migrations.CreateModel(
            name='Theme',
            fields=[
                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                ('name', models.CharField(max_length=250, unique=True)),
                ('preview_image', models.ImageField(upload_to=settings.models.get_preview_path)),
                ('description', models.CharField(max_length=1000)),
                ('premium_user', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL)),
            ],
        ),
        migrations.CreateModel(
            name='ThemeAttribute',
            fields=[
                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                ('name', models.CharField(max_length=250)),
                ('type', models.CharField(choices=[(b'1', b'TextArea'), (b'2', b'Image'), (b'3', b'TextField')], max_length=1)),
                ('width', models.IntegerField(blank=True, null=True)),
                ('height', models.IntegerField(blank=True, null=True)),
                ('description', models.CharField(max_length=2500)),
                ('theme', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='attributes', to='settings.Theme')),
            ],
        ),
        migrations.CreateModel(
            name='ThemeImageAttribute',
            fields=[
                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                ('image', models.ImageField(blank=True, null=True, upload_to=settings.models.get_attribute_path)),
                ('attribute', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='image_attributes', to='settings.ThemeAttribute')),
                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL)),
            ],
        ),
        migrations.CreateModel(
            name='ThemeTextAttribute',
            fields=[
                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                ('text', models.CharField(blank=True, max_length=5000, null=True)),
                ('attribute', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='text_attributes', to='settings.ThemeAttribute')),
                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL)),
            ],
        ),
        migrations.CreateModel(
            name='ThemeTextFieldAttribute',
            fields=[
                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                ('text', models.CharField(blank=True, max_length=500, null=True)),
                ('attribute', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='textfield_attributes', to='settings.ThemeAttribute')),
                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL)),
            ],
        ),
        migrations.AddField(
            model_name='setting',
            name='theme',
            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, to='settings.Theme'),
        ),
        migrations.AddField(
            model_name='setting',
            name='user',
            field=models.OneToOneField(on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL),
        ),
        migrations.AlterUniqueTogether(
            name='themeattribute',
            unique_together=set([('theme', 'name')]),
        ),
    ]

This results in the following error message:

Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/home/user/Projects/shop/venv/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 353, in execute_from_command_line
    utility.execute()
  File "/home/user/Projects/shop/venv/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 345, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/user/Projects/shop/venv/local/lib/python2.7/site-packages/django/core/management/base.py", line 348, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/user/Projects/shop/venv/local/lib/python2.7/site-packages/django/core/management/base.py", line 399, in execute
    output = self.handle(*args, **options)
  File "/home/user/Projects/shop/venv/local/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 89, in handle
    executor = MigrationExecutor(connection, self.migration_progress_callback)
  File "/home/user/Projects/shop/venv/local/lib/python2.7/site-packages/django/db/migrations/executor.py", line 20, in __init__
    self.loader = MigrationLoader(self.connection)
  File "/home/user/Projects/shop/venv/local/lib/python2.7/site-packages/django/db/migrations/loader.py", line 49, in __init__
    self.build_graph()
  File "/home/user/Projects/shop/venv/local/lib/python2.7/site-packages/django/db/migrations/loader.py", line 170, in build_graph
    self.load_disk()
  File "/home/user/Projects/shop/venv/local/lib/python2.7/site-packages/django/db/migrations/loader.py", line 105, in load_disk
    migration_module = import_module("%s.%s" % (module_name, migration_name))
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/home/user/Projects/shop/settings/migrations/0001_initial.py", line 11, in <module>
    class Migration(migrations.Migration):
  File "/home/user/Projects/shop/settings/migrations/0001_initial.py", line 16, in Migration
    migrations.swappable_dependency(settings.AUTH_USER_MODEL),
AttributeError: 'module' object has no attribute 'AUTH_USER_MODEL'

[Tim Graham]

Duplicate of #26099