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
-# This is a no-op if observer_disabled is set to 1 in the config file
-from observer import *
+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
+ from observer import *
+except:
+ print >> sys.stderr, "import of observer failed! printing traceback and disabling observer:"
+ import traceback
+ traceback.print_exc()
+
+ # guard against something failing
+ 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()
- created = models.DateTimeField(auto_now_add=True)
- updated = models.DateTimeField(auto_now=True)
+ # default values for created and updated are only there to keep evolution
+ # from failing.
+ 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 get_field_diff(self, field_name):
return self.diff.get(field_name, None)
+ def can_update(self, user):
+ if user.is_readonly:
+ return False
+ if user.is_admin:
+ return True
+ return False
+
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)
+ purge = kwds.get('purge',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'])
- # This is a no-op if observer_disabled is set
- notify_observer(model=self, delete=True, pk=pk, model_dict=model_dict)
def save(self, *args, **kwargs):
super(PlCoreBase, self).save(*args, **kwargs)
-
+
# This is a no-op if observer_disabled is set
notify_observer()
self.__initial = self._dict
+ def save_by_user(self, user, *args, **kwds):
+ if self.can_update(user):
+ self.save(*args, **kwds)
+
+ def delete_by_user(self, user, *args, **kwds):
+ if self.can_update(user):
+ self.delete(*args, **kwds)
+
@property
def _dict(self):
return model_to_dict(self, fields=[field.name for field in