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_queryset(self):
26 return super(PlCoreBaseDeletionManager, self).get_query_set().filter(deleted=True)
28 # deprecated in django 1.7 in favor of get_queryset()
29 def get_query_set(self):
30 return self.get_queryset()
32 # This manager will be inherited by all subclasses because
33 # the core model is abstract.
34 class PlCoreBaseManager(models.Manager):
35 def get_queryset(self):
36 return super(PlCoreBaseManager, self).get_query_set().filter(deleted=False)
38 # deprecated in django 1.7 in favor of get_queryset()
39 def get_query_set(self):
40 return self.get_queryset()
42 class PlCoreBase(models.Model):
43 objects = PlCoreBaseManager()
44 deleted_objects = PlCoreBaseDeletionManager()
46 # default values for created and updated are only there to keep evolution
48 created = models.DateTimeField(auto_now_add=True, default=datetime.datetime.now)
49 updated = models.DateTimeField(auto_now=True, default=datetime.datetime.now)
50 enacted = models.DateTimeField(null=True, default=None)
51 backend_status = models.CharField(max_length=140,
52 default="Provisioning in progress")
53 deleted = models.BooleanField(default=False)
56 # Changing abstract to False would require the managers of subclasses of
57 # PlCoreBase to be customized individually.
61 def __init__(self, *args, **kwargs):
62 super(PlCoreBase, self).__init__(*args, **kwargs)
63 self.__initial = self._dict
69 diffs = [(k, (v, d2[k])) for k, v in d1.items() if v != d2[k]]
73 def has_changed(self):
74 return bool(self.diff)
77 def changed_fields(self):
78 return self.diff.keys()
80 def get_field_diff(self, field_name):
81 return self.diff.get(field_name, None)
83 def can_update(self, user):
90 def delete(self, *args, **kwds):
91 # so we have something to give the observer
92 purge = kwds.get('purge',False)
94 purge = purge or observer_disabled
100 super(PlCoreBase, self).delete(*args, **kwds)
104 self.save(update_fields=['enacted','deleted'])
107 def save(self, *args, **kwargs):
108 super(PlCoreBase, self).save(*args, **kwargs)
110 # This is a no-op if observer_disabled is set
113 self.__initial = self._dict
115 def save_by_user(self, user, *args, **kwds):
116 if self.can_update(user):
117 self.save(*args, **kwds)
119 def delete_by_user(self, user, *args, **kwds):
120 if self.can_update(user):
121 self.delete(*args, **kwds)
125 return model_to_dict(self, fields=[field.name for field in