Update changes.py

Author: bhkim7000

django_model_changes/changes.py

@@ -76,6 +76,9 @@ def __init__(self, *args, **kwargs):
  dispatch_uid='django-changes-%s' % self.__class__.__name__
  )
 
+ def _state_fields(self):
+ return [f for f in self._meta.get_fields() if f.concrete and not f.many_to_many]
+
  def _save_state(self, new_instance=False, event_type='save'):
  # Pipe the pk on deletes so that a correct snapshot of the current
  # state can be taken.
@@ -100,8 +103,8 @@ def current_state(self):
  Returns a ``field -> value`` dict of the current state of the instance.
  """
  field_names = set()
- [field_names.add(f.name) for f in self._meta.local_fields]
- [field_names.add(f.attname) for f in self._meta.local_fields]
+ [field_names.add(f.name) for f in self._state_fields()]
+ [field_names.add(f.attname) for f in self._state_fields()]
  return dict([(field_name, getattr(self, field_name, None)) for field_name in field_names])
 
  def previous_state(self):