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
11 # This is a no-op if observer_disabled is set to 1 in the config file
12 from observer import *
14 print >> sys.stderr, "import of observer failed! printing traceback and disabling observer:"
18 # guard against something failing
19 def notify_observer(*args, **kwargs):
22 # This manager will be inherited by all subclasses because
23 # the core model is abstract.
24 class PlCoreBaseDeletionManager(models.Manager):
25 def get_query_set(self):
26 return super(PlCoreBaseDeletionManager, self).get_query_set().filter(deleted=True)
28 # This manager will be inherited by all subclasses because
29 # the core model is abstract.
30 class PlCoreBaseManager(models.Manager):
31 def get_query_set(self):
32 return super(PlCoreBaseManager, self).get_query_set().filter(deleted=False)
34 class PlCoreBase(models.Model):
35 objects = PlCoreBaseManager()
36 deleted_objects = PlCoreBaseDeletionManager()
38 # default values for created and updated are only there to keep evolution
40 created = models.DateTimeField(auto_now_add=True, default=datetime.datetime.now())
41 updated = models.DateTimeField(auto_now=True, default=datetime.datetime.now())
42 enacted = models.DateTimeField(null=True, default=None)
43 backend_status = models.CharField(max_length=140,
44 default="Provisioning in progress")
45 deleted = models.BooleanField(default=False)
48 # Changing abstract to False would require the managers of subclasses of
49 # PlCoreBase to be customized individually.
53 def __init__(self, *args, **kwargs):
54 super(PlCoreBase, self).__init__(*args, **kwargs)
55 self.__initial = self._dict
61 diffs = [(k, (v, d2[k])) for k, v in d1.items() if v != d2[k]]
65 def has_changed(self):
66 return bool(self.diff)
69 def changed_fields(self):
70 return self.diff.keys()
72 def get_field_diff(self, field_name):
73 return self.diff.get(field_name, None)
75 def can_update(self, user):
82 def delete(self, *args, **kwds):
83 # so we have something to give the observer
84 purge = kwds.get('purge',False)
86 purge = purge or observer_disabled
92 super(PlCoreBase, self).delete(*args, **kwds)
96 self.save(update_fields=['enacted','deleted'])
99 def save(self, *args, **kwargs):
100 super(PlCoreBase, self).save(*args, **kwargs)
102 # This is a no-op if observer_disabled is set
105 self.__initial = self._dict
107 def save_by_user(self, user, *args, **kwds):
108 if self.can_update(user):
109 self.save(*args, **kwds)
111 def delete_by_user(self, user, *args, **kwds):
112 if self.can_update(user):
113 self.delete(*args, **kwds)
117 return model_to_dict(self, fields=[field.name for field in