edoburu/django-polymorphic-tree — pull request #17 by vinnyrose (2014-06-04 13:35:54+00:00)
Title: Pass previous parent id to moved.save so that children objects can compa...

...re.

Since the model is reloaded from database it is impossible to compare
between original parent (i.e. cached) and new parent in children objects
without explicitly passing in the previous parent id to the save method.