Django 1.8 migrations - CircularDependencyError

Question

I have 2 django apps i.e. main and authtools. When I run

python manage.py migrate

, I get a CircularDependencyError:

raise CircularDependencyError(", ".join("%s.%s" % n for n in cycle))
django.db.migrations.graph.CircularDependencyError: main.0001_initial, authtools.0001_initial

In my setting file I have the AUTH_USER_MODEL defined as such:AUTH_USER_MODEL = 'authtools.User' . The migration files created look like this: For the authtools app, it shows dependancies as:

dependencies = [
        ('main', '__first__'),
        ('auth', '0001_initial'),
    ]

And for the main app, the depandancies are shown as:

dependencies = [
        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
    ]

What could be wrong?

Answer 1

If you use ManyToMany + 'through' option to different application, than according to this answer you should:

1. Comment a whole line where you use ManyToMany+through by putting # at the beginning of the line
2. makemigrations of_all_apps_you_need (also the one where the line from p1 exist)
3. uncomment the line from p1
4. makemigrations the_app_where_the_line_from_p1_exist
5. migrate

If you dont use ManyToMany, than according to this answer, try similar actions.

Lets suppose that you want to create these models:

libros/models.py:

class Libro(models.Model):
    name = models.CharField(max_length=20)
    perfile = models.ForeignKey('perfiles.Perfile', null=True)

perfiles/models.py:

class Perfile(models.Model):
    name = models.CharField(max_length=20)
    libro = models.ForeignKey('libros.Libro', null=True)

Of course you can't do it because of the circular dependency. So comment out foreign key in the Libro model:

class Libro(models.Model):
    name = models.CharField(max_length=20)
    # perfile = models.ForeignKey('perfiles.Perfile', null=True)

And run two migrations:

python manage.py makemigrations libros
python manage.py makemigrations perfiles

After that uncomment the perfile foreign key in the Libro model and run another migration:

python manage.py makemigrations libros

Answer 2

I think you need to follow this ticket of django code base: https://code.djangoproject.com/ticket/22932

According to them your migration code should look like either this (https://code.djangoproject.com/attachment/ticket/22932/team.0001_initial.py.diff) or(https://code.djangoproject.com/attachment/ticket/22932/team.0002_auto_20140704_1453.py):

# -*- coding: utf-8 -*-
2   from __future__ import unicode_literals
3   
4   from django.db import models, migrations
5   from django.conf import settings
6   
7   
8   class Migration(migrations.Migration):
9   
10      dependencies = [
11          migrations.swappable_dependency(settings.AUTH_USER_MODEL),
12          ('team', '0001_initial'),
13      ]
14  
15      operations = [
16          migrations.CreateModel(
17              name='TeamCaptain',
18              fields=[
19                  ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
20                  ('rider', models.ForeignKey(to=settings.AUTH_USER_MODEL)),
21                  ('team', models.ForeignKey(to='team.Team')),
22              ],
23              options={
24              },
25              bases=(models.Model,),
26          ),
27      ]