blob: efe381c6610b96895e167b3fb95b9e6e7bd98a9f [file] [log] [blame]
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
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_query_set(self):
return super(PlCoreBaseDeletedManager, self).get_query_set().filter(deleted=True)
# This manager will be inherited by all subclasses because
# the core model is abstract.
class PlCoreBaseManager(models.Manager):
def get_query_set(self):
return super(PlCoreBaseManager, self).get_query_set().filter(deleted=False)
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())
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
@property
def diff(self):
d1 = self.__initial
d2 = self._dict
diffs = [(k, (v, d2[k])) for k, v in d1.items() if v != d2[k]]
return dict(diffs)
@property
def has_changed(self):
return bool(self.diff)
@property
def changed_fields(self):
return self.diff.keys()
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
purge = kwds.get('purge',False)
try:
purge = purge or observer_disabled
except NameError:
pass
if (purge):
super(PlCoreBase, self).delete(*args, **kwds)
else:
self.deleted = True
self.enacted=None
self.save(update_fields=['enacted','deleted'])
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
self._meta.fields])