I am getting the "standard" CircularDependencyError (Django 1.7c2 with
migrations) with ManyToManyFields and a custom user.
from django.db import models
from member.models import Member
from company.models import Company
class Affiliation( models.Model ):
member = models.ForeignKey( Member )
company = models.ForeignKey( Company )
--
from django.db import models
class Company( models.Model ):
name = models.CharField(max_length=100)
members = models.ManyToManyField( 'member.Member',
through='affiliation.Affiliation' )
--
class Member( AbstractBaseUser, PermissionsMixin ):
username = models.CharField(max_length=100, unique=True)
first_name = models.CharField(max_length=100)
last_name = models.CharField(max_length=100)
companies = models.ManyToManyField( 'company.Company',
through='affiliation.Affiliation')
is_active = models.BooleanField( default=True )
is_staff = models.BooleanField( default=False )
USERNAME_FIELD = 'username'
REQUIRED_FIELDS = ['email', 'first_name', 'last_name']
objects = MemberManager()
When I run makemigrations it *appears* to be putting the m2m in the second
run of the migration:
$ python manage.py makemigrations member company
Migrations for 'member':
0001_initial.py:
- Create model Member
Migrations for 'affiliation':
0001_initial.py:
- Create model Affiliation
0002_auto_20140816_1407.py:
- Add field company to affiliation
- Add field member to affiliation
Migrations for 'company':
0001_initial.py:
- Create model Company
According to Django this needs to be done manually but it appears to have
been done automatically.
*In addition, you may run into a CircularDependencyError when running your
migrations as Django won’t be able to automatically break the dependency
loop due to the dynamic dependency. If you see this error, you should break
the loop by moving the models depended on by your User model into a second
migration (you can try making two normal models that have a ForeignKey to
each other and seeing how makemigrations resolves that circular dependency
if you want to see how it’s usually done)*
But I am still getting the error:
django.db.migrations.graph.CircularDependencyError: [('affiliation',
u'0002_auto_20140816_1400'), (u'company', u'0001_initial'), ('member',
u'0001_initial'), (u'affiliation', u'0002_auto_20140816_1400')]
I am very confused how I am supposed to break the loop. There are several
things on Google about this but it is not clear to me of the correct
practice in 1.7(c2).
So, any help or ideas on this would be gratefully appreciated.
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