Moving from South to Django 1.7 migrations: swappable dependency - django

Question

I have a project written with Django 1.6 and that uses South migrations, and I trying to move it to Django 1.7. So I started from the instructions indicated here.
Deleted south from INSTALLED_APPS.
Removed old migrations files.
Ran ./manage.py makemigrations.
At this point I got django.db.migrations.graph.CircularDependencyError.
Here are my models:
customer.models.py:
class Customer(models.Model):
name = models.CharField(
max_length=128,
)
class Department(models.Model):
customer = models.ForeignKey(
'customer.Customer',
related_name='departments',
)
name = models.CharField(
max_length=64,
)
class Representative(models.Model):
user = models.ForeignKey(
'userprofile.User',
related_name='representatives',
)
department = models.ForeignKey(
'customer.Department',
related_name='representatives',
)
userprofile.models.py:
class User(AbstractBaseUser, PermissionsMixin):
customers = models.ManyToManyField(
'customer.Customer',
blank=True,
null=True,
)
That caused in initial migration for customer application a swappable dependency:
dependencies = [
migrations.swappable_dependency(settings.AUTH_USER_MODEL),
]
As it was recommended here, I edited initial migration for userprofile and commented lines related with customer:
class Migration(migrations.Migration):
dependencies = [
('auth', '0001_initial'),
#('customer', '0001_initial'),
]
operations = [
migrations.CreateModel(
name='User',
fields=[
('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
('first_name', models.CharField(max_length=128, error_messages={b'min_length': 'El campo "Nombres" debe tener al menos %(limit_value)d caracteres (actualmente tiene %(show_value)d).'}, verbose_name='nombres', validators=[django.core.validators.MinLengthValidator(3)])),
('last_name', models.CharField(max_length=128, error_messages={b'min_length': 'El campo "Apellidos" debe tener al menos %(limit_value)d caracteres (actualmente tiene %(show_value)d).'}, verbose_name='apellidos', validators=[django.core.validators.MinLengthValidator(3)])),
('email', models.EmailField(unique=True, max_length=75, verbose_name='correo electr\xf3nico')),
#('customers', models.ManyToManyField(to='customer.Customer', null=True, verbose_name='clientes relacionados', blank=True)),
],
bases=(models.Model,),
),
]
ran ./manage.py migrate and created another migration that adds a customer field:
class Migration(migrations.Migration):
dependencies = [
('customer', '0001_initial'),
('userprofile', '0001_initial'),
]
operations = [
migrations.AddField(
model_name='user',
name='customers',
field=models.ManyToManyField(to='customer.Customer', null=True, verbose_name='clientes relacionados', blank=True),
preserve_default=True,
),
]
But when I run ./manage.py migrate userprofile --fake, I get an error
Running migrations:
No migrations to apply.
Your models have changes that are not yet reflected in a migration, and so won't be applied.
Run 'manage.py makemigrations' to make new migrations, and then re-run 'manage.py migrate' to apply them.
On the other hand, without this migration my tests fail:
OperationalError: no such table: userprofile_user_customers

Answer 1

My error was to run ./manage.py makemigrations userprofile, instead of running ./manage.py makemigrations userprofile --empty. In the first case Django understood it like a migration that adds contracts field (which it is) and for the second case, if I ran ./manage.py migrate userprofile it fails with:
django.db.utils.ProgrammingError: relation "userprofile_user_customers" already exists
So I had to:
Copy the content of the last migration:
class Migration(migrations.Migration):
dependencies = [
('customer', '0001_initial'),
('userprofile', '0001_initial'),
]
operations = [
migrations.AddField(
model_name='user',
name='customers',
field=models.ManyToManyField(to='customer.Customer', null=True, verbose_name='clientes relacionados', blank=True),
preserve_default=True,
),
]
Delete that migration.
Run ./manage.py makemigrations userprofile --empty.
Paste and run ./manage.py migrate userprofile --fake.