Using Mixins to add common fields to a model doesn't work

[Stuart Axon]

I tried using a mixin with some common fields, but it doesn't work:

class CeleryTaskMixin:
    celery_status = models.CharField()  # last known status, call update_status
    celery_id = models.CharField()      # celery uuid
    f_name = models.CharField(indexed=True)


class RunningTask(CeleryTaskMixin, models.Model):
    def __init__(self, t=None, *args, **kwargs):
        CeleryTaskMixin.__init__(self)
        models.Model.__init__(self)

    task_type = models.CharField()
    start_time = models.DateTimeField(auto_now=True)
    end_time = models.DateTimeField()

Then when I try and do

models.RunningTask.objects.filter(f_name="blah")

It says

  File "/home/stu/.virtualenvs/ng/src/redisco/redisco/models/modelset.py", line 52, in __iter__
    for id in self._set:
  File "/home/stu/.virtualenvs/ng/src/redisco/redisco/models/modelset.py", line 294, in _set
    s = self._add_set_filter(s)
  File "/home/stu/.virtualenvs/ng/src/redisco/redisco/models/modelset.py", line 317, in _add_set_filter
    (k, self.model_class.__name__))
redisco.models.exceptions.AttributeNotIndexed: Attribute f_name is not indexed in RunningTask class.

This seems like something that should work... (?)

[Stuart Axon]

Ah, I made the baseclass extend the Model as well and things seem to work ... but does that mean I now have two models in the database ?

[Stuart Axon]

DOH - I was initializing the Model constructor like models.Model.__init__(self) not models.Model.__init__(self, *args, **kwargs)