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(PlCoreBaseDeletedManager, 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)
34 class PlCoreBase(models.Model):
35 objects = PlCoreBaseManager()
36 deleted_objects = PlCoreBaseDeletionManager()
37 created = models.DateTimeField(auto_now_add=True)
38 updated = models.DateTimeField(auto_now=True)
39 # default values for created and updated are only there to keep evolution
42 created = models.DateTimeField(auto_now_add=True, default=datetime.datetime.now())
43 updated = models.DateTimeField(auto_now=True, default=datetime.datetime.now())
44 enacted = models.DateTimeField(null=True, default=None)
45 backend_status = models.CharField(max_length=140,
46 default="Provisioning in progress")
47 deleted = models.BooleanField(default=False)
50 # Changing abstract to False would require the managers of subclasses of
51 # PlCoreBase to be customized individually.
55 def __init__(self, *args, **kwargs):
56 super(PlCoreBase, self).__init__(*args, **kwargs)
57 self.__initial = self._dict
63 diffs = [(k, (v, d2[k])) for k, v in d1.items() if v != d2[k]]
67 def has_changed(self):
68 return bool(self.diff)
71 def changed_fields(self):
72 return self.diff.keys()
74 def get_field_diff(self, field_name):
75 return self.diff.get(field_name, None)
77 def can_update(self, user):
84 def delete(self, *args, **kwds):
85 # so we have something to give the observer
86 purge = kwds.get('purge',False)
88 purge = purge or observer_disabled
93 super(PlCoreBase, self).delete(*args, **kwds)
97 self.save(update_fields=['enacted','deleted'])
100 def save(self, *args, **kwargs):
101 super(PlCoreBase, self).save(*args, **kwargs)
103 # This is a no-op if observer_disabled is set
106 self.__initial = self._dict
108 def save_by_user(self, user, *args, **kwds):
109 if self.can_update(user):
110 self.save(*args, **kwds)
112 def delete_by_user(self, user, *args, **kwds):
113 if self.can_update(user):
114 self.delete(*args, **kwds)
118 return model_to_dict(self, fields=[field.name for field in