+ def __unicode__(self):
+ return self.email
+
+ @classmethod
+ def is_optout(cls, email):
+ email = email.lower().strip()
+ return cls.objects.filter(email = email).count() > 0
+
+class PatchChangeNotification(models.Model):
+ patch = models.ForeignKey(Patch, primary_key = True)
+ last_modified = models.DateTimeField(default = datetime.datetime.now)
+ orig_state = models.ForeignKey(State)
+
+def _patch_change_callback(sender, instance, **kwargs):
+ # we only want notification of modified patches
+ if instance.pk is None:
+ return
+
+ if instance.project is None or not instance.project.send_notifications:
+ return
+
+ try:
+ orig_patch = Patch.objects.get(pk = instance.pk)
+ except Patch.DoesNotExist:
+ return
+
+ # If there's no interesting changes, abort without creating the
+ # notification
+ if orig_patch.state == instance.state:
+ return
+
+ notification = None
+ try:
+ notification = PatchChangeNotification.objects.get(patch = instance)
+ except PatchChangeNotification.DoesNotExist:
+ pass
+
+ if notification is None:
+ notification = PatchChangeNotification(patch = instance,
+ orig_state = orig_patch.state)
+
+ elif notification.orig_state == instance.state:
+ # If we're back at the original state, there is no need to notify
+ notification.delete()
+ return
+
+ notification.last_modified = datetime.datetime.now()
+ notification.save()
+
+models.signals.pre_save.connect(_patch_change_callback, sender = Patch)