Django 1.4 enabling compositekey breaks unrelated models

[anentropic]

I wanted to use compositekey in the following model:

from compositekey import db

class Relationship(models.Model):
    class Meta:
        db_table = 'follows'

    id = db.MultiFieldPK("u", "tu")
    u = models.IntegerField(db_column='user_id')
    tu = models.IntegerField(db_column='target_user_id')
    d = models.DateTimeField(db_column='created', default=datetime.utcnow)

It's a new model and none of my other models have any fk relation to it.

However when I add this I get an exception when I try a manage.py shell etc

  File "/Users/anentropic/Documents/Dev/Work/myproj/otherapp/models.py", line 57, in <module>
    class UnrelatedModel(AnotherUnrelatedModel):
  File "/Users/anentropic/.virtualenvs/myproj/lib/python2.7/site-packages/django/db/models/base.py", line 167, in __new__
    new_class.add_to_class(field.name, copy.deepcopy(field))
  File "/Users/anentropic/.virtualenvs/myproj/lib/python2.7/site-packages/django/db/models/base.py", line 219, in add_to_class
    value.contribute_to_class(cls, name)
  File "/Users/anentropic/.virtualenvs/myproj/lib/python2.7/site-packages/compositekey/db/models/fields/related.py", line 31, in contribute_to_class
    assert not self.fields_ext or not self._fields,\
AttributeError: 'ForeignKey' object has no attribute 'fields_ext'

As best I can tell it looks like maybe the fk monkeypatch has arrived too late to affect models which have already been imported by the time I reach my first model using a composite key?

if so it's odd that this isn't mentioned in the docs?

[anentropic]

Yes, that seems to be the case. I assume not specific to Django 1.4... maybe in later djangoes there's a better workaround though.

My solution was to create a dummy app:

myproj/first/
myproj/first/__init__.py
myproj/first/models.py

myproj/first/models.py

from compositekey.patch import django_compositekey_patch
django_compositekey_patch()

myproj/settings.py

INSTALLED_APPS = (
    'first',  # monkeypatch django model stuff before any other apps

    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.sites',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    ...
}