Cascading deletions for dependent objects

[plstackapi.git] / planetstack / model_policy.py

diff --git a/planetstack/model_policy.py b/planetstack/model_policy.py
index dbe8453..7dc6dda 100644 (file)
--- a/planetstack/model_policy.py
+++ b/planetstack/model_policy.py
@@ -2,16 +2,35 @@ from django.db.models.signals import post_save
 from django.dispatch import receiver
 import pdb
 from core.models import *
+from dependency_walker import *
 import model_policies
 
+def update_dep(d, o):
+       if (d.updated < o.updated):
+               d.save(update_fields=['updated'])
+       
+def delete_if_inactive(d, o):
+       #print "Deleting %s (%s)"%(d,d.__class__.__name__)
+       d.delete()      
+       return
+
 @receiver(post_save)
-def post_save_handler(sender, **kwargs):
+def post_save_handler(sender, instance, **kwargs):
        sender_name = sender.__name__
        policy_name = 'model_policy_%s'%sender_name
        
        if (not kwargs['update_fields']):
+               # Automatic dirtying
+               walk_inv_deps(update_dep, instance)
+
                try:
-                       policy_handler = getattr(model_policies, policy_name)
-                       policy_handler.handle(sender)
+                       policy_handler = getattr(model_policies, policy_name, None)
+                       if policy_handler is not None:
+                               policy_handler.handle(instance)
+                       
+                       
                except:
                        pass
+       elif 'deleted' in kwargs['update_fields']:
+               walk_inv_deps(delete_if_inactive, instance)
+