4 from django.db import models
5 from django.forms.models import model_to_dict
6 from django.core.urlresolvers import reverse
7 from django.forms.models import model_to_dict
10 # This is a no-op if observer_disabled is set to 1 in the config file
11 from observer import *
13 print >> sys.stderr, "import of observer failed! printing traceback and disabling observer:"
17 # guard against something failing
18 def notify_observer(*args, **kwargs):
21 # This manager will be inherited by all subclasses because
22 # the core model is abstract.
23 class PlCoreBaseDeletionManager(models.Manager):
24 def get_query_set(self):
25 return super(PlCoreBaseDeletionManager, self).get_query_set().filter(deleted=True)
27 # This manager will be inherited by all subclasses because
28 # the core model is abstract.
29 class PlCoreBaseManager(models.Manager):
30 def get_query_set(self):
31 return super(PlCoreBaseManager, self).get_query_set().filter(deleted=False)
33 class PlCoreBase(models.Model):
34 objects = PlCoreBaseManager()
35 deleted_objects = PlCoreBaseDeletionManager()
37 # default values for created and updated are only there to keep evolution
39 created = models.DateTimeField(auto_now_add=True, default=datetime.datetime.now())
40 updated = models.DateTimeField(auto_now=True, default=datetime.datetime.now())
41 enacted = models.DateTimeField(null=True, default=None)
42 backend_status = models.CharField(max_length=140,
43 default="Provisioning in progress")
44 deleted = models.BooleanField(default=False)
47 # Changing abstract to False would require the managers of subclasses of
48 # PlCoreBase to be customized individually.
52 def __init__(self, *args, **kwargs):
53 super(PlCoreBase, self).__init__(*args, **kwargs)
54 self.__initial = self._dict
60 diffs = [(k, (v, d2[k])) for k, v in d1.items() if v != d2[k]]
64 def has_changed(self):
65 return bool(self.diff)
68 def changed_fields(self):
69 return self.diff.keys()
71 def get_field_diff(self, field_name):
72 return self.diff.get(field_name, None)
74 def can_update(self, user):
81 def delete(self, *args, **kwds):
82 # so we have something to give the observer
83 purge = kwds.get('purge',False)
85 purge = purge or observer_disabled
90 super(PlCoreBase, self).delete(*args, **kwds)
94 self.save(update_fields=['enacted','deleted'])
97 def save(self, *args, **kwargs):
98 super(PlCoreBase, self).save(*args, **kwargs)
100 # This is a no-op if observer_disabled is set
103 self.__initial = self._dict
105 def save_by_user(self, user, *args, **kwds):
106 if self.can_update(user):
107 self.save(*args, **kwds)
109 def delete_by_user(self, user, *args, **kwds):
110 if self.can_update(user):
111 self.delete(*args, **kwds)
115 return model_to_dict(self, fields=[field.name for field in