planetstack/model_policy.py

   1 from django.db.models.signals import post_save
   2 from django.dispatch import receiver
   3 import pdb
   4 from core.models import *
   5 from dependency_walker import *
   6 import model_policies
   7
   8 def update_dep(d, o):
   9         print "Updating %s (%s)"%(d,d.__class__.__name__)
  10         if (d.updated < o.updated):
  11                 d.save(update_fields=['updated'])
  12
  13 @receiver(post_save)
  14 def post_save_handler(sender, instance, **kwargs):
  15         sender_name = sender.__name__
  16         policy_name = 'model_policy_%s'%sender_name
  17
  18         if (not kwargs['update_fields']):
  19                 # Automatic dirtying
  20                 walk_inv_deps(update_dep, instance)
  21
  22                 try:
  23                         policy_handler = getattr(model_policies, policy_name, None)
  24                         if policy_handler is not None:
  25                                 policy_handler.handle(instance)
  26
  27
  28                 except:
  29                         pass
  30