-import datetime
import os
import sys
from django.db import models
from django.forms.models import model_to_dict
from django.core.urlresolvers import reverse
from django.forms.models import model_to_dict
+from django.utils import timezone
+import model_policy
try:
# This is a no-op if observer_disabled is set to 1 in the config file
def notify_observer(*args, **kwargs):
pass
+# This manager will be inherited by all subclasses because
+# the core model is abstract.
+class PlCoreBaseDeletionManager(models.Manager):
+ def get_queryset(self):
+ parent=super(PlCoreBaseDeletionManager, self)
+ if hasattr(parent, "get_queryset"):
+ return parent.get_queryset().filter(deleted=True)
+ else:
+ return parent.get_query_set().filter(deleted=True)
+
+ # deprecated in django 1.7 in favor of get_queryset().
+ def get_query_set(self):
+ return self.get_queryset()
+
+# This manager will be inherited by all subclasses because
+# the core model is abstract.
+class PlCoreBaseManager(models.Manager):
+ def get_queryset(self):
+ parent=super(PlCoreBaseManager, self)
+ if hasattr(parent, "get_queryset"):
+ return parent.get_queryset().filter(deleted=False)
+ else:
+ return parent.get_query_set().filter(deleted=False)
+
+ # deprecated in django 1.7 in favor of get_queryset().
+ def get_query_set(self):
+ return self.get_queryset()
+
class PlCoreBase(models.Model):
+ objects = PlCoreBaseManager()
+ deleted_objects = PlCoreBaseDeletionManager()
# default values for created and updated are only there to keep evolution
# from failing.
-
- created = models.DateTimeField(auto_now_add=True, default=datetime.datetime.now())
- updated = models.DateTimeField(auto_now=True, default=datetime.datetime.now())
+ created = models.DateTimeField(auto_now_add=True, default=timezone.now)
+ updated = models.DateTimeField(auto_now=True, default=timezone.now)
enacted = models.DateTimeField(null=True, default=None)
backend_status = models.CharField(max_length=140,
default="Provisioning in progress")
deleted = models.BooleanField(default=False)
class Meta:
+ # Changing abstract to False would require the managers of subclasses of
+ # PlCoreBase to be customized individually.
abstract = True
app_label = "core"
def __init__(self, *args, **kwargs):
super(PlCoreBase, self).__init__(*args, **kwargs)
self.__initial = self._dict
+ self.silent = False
@property
def diff(self):
def delete(self, *args, **kwds):
# so we have something to give the observer
- pk = self.pk
- model_dict = model_to_dict(self)
- for (k,v) in model_dict.items():
- # things like datetime are not JSON serializable
- model_dict[k] = str(v)
-
- super(PlCoreBase, self).delete(*args, **kwds)
-
- # This is a no-op if observer_disabled is set
- notify_observer(model=self, delete=True, pk=pk, model_dict=model_dict)
+ purge = kwds.get('purge',False)
+ silent = kwds.get('silent',False)
+ try:
+ purge = purge or observer_disabled
+ except NameError:
+ pass
+
+ if (purge):
+ del kwds['purge']
+ super(PlCoreBase, self).delete(*args, **kwds)
+ else:
+ self.deleted = True
+ self.enacted=None
+ self.save(update_fields=['enacted','deleted'], silent=silent)
def save(self, *args, **kwargs):
+ # let the user specify silence as either a kwarg or an instance varible
+ silent = self.silent
+ if "silent" in kwargs:
+ silent=silent or kwargs.pop("silent")
+
super(PlCoreBase, self).save(*args, **kwargs)
-
+
# This is a no-op if observer_disabled is set
- notify_observer()
+ if not silent:
+ notify_observer()
self.__initial = self._dict