TrackStateMixin to track updated fields in django model

track_state_mixin.py

# -*- coding: utf-8 -*-
from django.db.models.signals import post_save

#https://github.com/citylive/django-states2

#inspired on http://stackoverflow.com/questions/110803/dirty-fields-in-django
class TrackStateMixin(object):
    def __init__(self, *args, **kwargs):
        super(TrackStateMixin, self).__init__(*args, **kwargs)
        self._original_state = self._as_dict()

    def _reset_state(self, *args, **kwargs):
        self._original_state = self._as_dict()

    def _as_dict(self):
        return dict([(f.attname, getattr(self, f.attname)) for f in self._meta.local_fields])

    def get_updated_fields(self):
        new_state = self._as_dict()
        return dict([(key, [ value, new_state[key] ]) for key, value in self._original_state.iteritems() if value != new_state[key]])

    def update_callback(self):

    def save(self, *args, **kwargs):
    	super(TrackStateMixin, self).save(*args, **kwargs)
    	updated_fields = self.get_updated_fields()