Exception making migrations with a SortedOneToManyField

[riconnon]

After adding a SortedOneToManyField to my model and running makemigrations I see the following exception.

Traceback (most recent call last):
  File "./manage.py", line 22, in <module>
    execute_from_command_line(sys.argv)
  File "/Users/rconnon/.virtualenvs/bin/django/lib/python3.6/site-packages/django/core/management/__init__.py", line 364, in execute_from_command_line
    utility.execute()
  File "/Users/rconnon/.virtualenvs/bin/django/lib/python3.6/site-packages/django/core/management/__init__.py", line 338, in execute
    django.setup()
  File "/Users/rconnon/.virtualenvs/bin/django/lib/python3.6/site-packages/django/__init__.py", line 27, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/Users/rconnon/.virtualenvs/bin/django/lib/python3.6/site-packages/django/apps/registry.py", line 108, in populate
    app_config.import_models()
  File "/Users/rconnon/.virtualenvs/bin/django/lib/python3.6/site-packages/django/apps/config.py", line 202, in import_models
    self.models_module = import_module(models_module_name)
  File "/usr/local/Cellar/python3/3.6.2/Frameworks/Python.framework/Versions/3.6/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 978, in _gcd_import
  File "<frozen importlib._bootstrap>", line 961, in _find_and_load
  File "<frozen importlib._bootstrap>", line 950, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 655, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 205, in _call_with_frames_removed
  File "/Users/rconnon/src/test_project/test_app/models.py", line 9, in <module>
    class B (models.Model):
  File "/Users/rconnon/.virtualenvs/bin/django/lib/python3.6/site-packages/django/db/models/base.py", line 162, in __new__
    new_class.add_to_class(obj_name, obj)
  File "/Users/rconnon/.virtualenvs/bin/django/lib/python3.6/site-packages/django/db/models/base.py", line 331, in add_to_class
    value.contribute_to_class(cls, name)
  File "/Users/rconnon/.virtualenvs/bin/django/lib/python3.6/site-packages/sortedm2m/fields.py", line 265, in contribute_to_class
    rel.through = self.create_intermediate_model(cls)
  File "/Users/rconnon/.virtualenvs/bin/django/lib/python3.6/site-packages/sortedm2m/fields.py", line 410, in create_intermediate_model
    return self.create_intermediate_model_from_attrs(klass, attrs)
  File "/Users/rconnon/.virtualenvs/bin/django/lib/python3.6/site-packages/sortedm2m/fields.py", line 386, in create_intermediate_model_from_attrs
    base_classes = (self.base_class, models.Model) if self.base_class else (models.Model,)
AttributeError: 'SortedOneToManyField' object has no attribute 'base_class'

[tony]

When converting a field from Django-sortedm2m to Django-sortedone2many, I encountered this error upon migration also.

Python 3
Django 1.11.6
django-sortedm2m 1.5..0
django-sortedone2many 0.2.2

You'll probably want to fix this, since most users coming from Django-sortedm2m are going to experience this.

[tony]

Even deleted the old sortedm2m field via a migration, and making a new migration won't work. That's no good.

[tony]

I'm probably just going to axe sortedm2m and make a weight/page column and sort through that. Can't deal with the headaches.