Обновление Django 1.5 1.8 BaseModel c __metaclass__?

Question

[NotProblem]

Добрый день! Пытаюсь обновить проект с 1.5 до 1.8, в проекте есть приложение к моделям которого идет обращение через миделваре, Приложение с настройками сайта, с заменой "на лету", оно состоит из models.py admin.py, в модели код:

# models.py 

#coding=utf-8

from django.db import models
from django.db.models.loading import get_model



class MetaSetting(models.base.ModelBase):

    """
    For easy to use settings(Setting model).
    Instead of Setting.objects.get(name='KEY'), you can use Setting.KEY
    """

    def __getattr__(cls, key):

        _model = get_model('options', 'Option')

        try:
            val = _model.objects.get(name=key).value
        except _model.DoesNotExist:
            val = None

        if isinstance(val, basestring):
            val = val.encode('utf-8')

        return val

    def set_value(self, key, value, value_type=unicode):

        """
        key = key,
        value = value,
        value_type accept following values:
                unicode
                int
                float

        value_type default - basestring
        """

        _model = get_model('options', 'Option')

        if _model.objects.filter(name=key).exists():
            _model.objects.filter(name=key).update(val=value)

        else:
            _model.objects.create(name=key, val=value,
                                  value_type=Option.VALUE_TYPE_MAPPING.get(value_type))


class Option(models.Model):

    """
    Simple project settings
    """

    __metaclass__ = MetaSetting

    class Meta:
        verbose_name = u'Настройка'
        verbose_name_plural = u'Настройки'
        db_table = 'settings_setting'

    VALUE_TYPE_CHOICES = (
        (1, u'Строка',),
        (2, u'Целое',),
        (3, u'Вещественное',),
        # (4, u'Булево',),
    )

    VALUE_TYPE_MAPPING = {float: 3, int: 2, unicode: 1}

    VALUE_TYPE_CONVERTER = {
        1: lambda x: unicode(x),
        2: lambda x: int(x),
        3: lambda x: float(x),
        # 4: lambda x: bool(x),
    }

    name = models.CharField(u'Ключ', max_length=100, unique=True)
    val = models.TextField(u'Значение')
    value_type = models.PositiveSmallIntegerField(u'Тип значения', choices=VALUE_TYPE_CHOICES)

    @property
    def value(self):

        return self.VALUE_TYPE_CONVERTER[self.value_type](self.val)

в settings.INSTALL_APPS [
...
'app.options',
...
При обновлении по логике обновления джанги добавил apps.py:

#coding=utf-8
from __future__ import unicode_literals

from django.apps import AppConfig


class OptionsConfig(AppConfig):
    name = 'app.options'

    def ready(self):
        from app.options.models import Option

при запуске выходит:

Traceback (most recent call last):
  File "/home/dev/virtualenvs/encased16/local/lib/python2.7/site-packages/django/utils/autoreload.py", line 229, in wrapper
    fn(*args, **kwargs)
  File "/home/dev/virtualenvs/encased16/local/lib/python2.7/site-packages/django/core/management/commands/runserver.py", line 107, in inner_run
    autoreload.raise_last_exception()
  File "/home/dev/virtualenvs/encased16/local/lib/python2.7/site-packages/django/utils/autoreload.py", line 252, in raise_last_exception
    six.reraise(*_exception)
  File "/home/dev/virtualenvs/encased16/local/lib/python2.7/site-packages/django/utils/autoreload.py", line 229, in wrapper
    fn(*args, **kwargs)
  File "/home/dev/virtualenvs/encased16/local/lib/python2.7/site-packages/django/__init__.py", line 18, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/home/dev/virtualenvs/encased16/local/lib/python2.7/site-packages/django/apps/registry.py", line 108, in populate
    app_config.import_models(all_models)
  File "/home/dev/virtualenvs/encased16/local/lib/python2.7/site-packages/django/apps/config.py", line 198, in import_models
    self.models_module = import_module(models_module_name)
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/home/dev/gitwork/encased/app/options/models.py", line 52, in <module>
    class Option(models.Model):
  File "/home/dev/virtualenvs/encased16/local/lib/python2.7/site-packages/django/db/models/base.py", line 90, in __new__
    base_meta = getattr(new_class, '_meta', None)
  File "/home/dev/gitwork/encased/app/options/models.py", line 17, in __getattr__
    _model = get_model('options', 'Option')
  File "/home/dev/virtualenvs/encased16/local/lib/python2.7/site-packages/django/apps/registry.py", line 199, in get_model
    self.check_models_ready()
  File "/home/dev/virtualenvs/encased16/local/lib/python2.7/site-packages/django/apps/registry.py", line 131, in check_models_ready
    raise AppRegistryNotReady("Models aren't loaded yet.")

Я так понимаю все дело в модели в:
__metaclass__ = MetaSetting
в которой берутся настройки меты из BaseModel, как заставить ее работать?