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 PlCoreBaseManager(models.Manager):
24 def get_query_set(self):
25 return super(PlCoreBaseManager, self).get_query_set().filter(deleted=False)
27 # default values for created and updated are only there to keep evolution
29 class PlCoreBase(models.Model):
30 objects = PlCoreBaseManager()
31 created = models.DateTimeField(auto_now_add=True, default=datetime.datetime.now())
32 updated = models.DateTimeField(auto_now=True, default=datetime.datetime.now())
33 enacted = models.DateTimeField(null=True, default=None)
34 backend_status = models.CharField(max_length=140,
35 default="Provisioning in progress")
36 deleted = models.BooleanField(default=False)
39 # Changing abstract to False would require the managers of subclasses of
40 # PlCoreBase to be customized individually.
44 def __init__(self, *args, **kwargs):
45 super(PlCoreBase, self).__init__(*args, **kwargs)
46 self.__initial = self._dict
52 diffs = [(k, (v, d2[k])) for k, v in d1.items() if v != d2[k]]
56 def has_changed(self):
57 return bool(self.diff)
60 def changed_fields(self):
61 return self.diff.keys()
63 def get_field_diff(self, field_name):
64 return self.diff.get(field_name, None)
66 def can_update(self, user):
73 def delete(self, *args, **kwds):
74 # so we have something to give the observer
76 model_dict = model_to_dict(self)
77 for (k,v) in model_dict.items():
78 # things like datetime are not JSON serializable
79 model_dict[k] = str(v)
81 super(PlCoreBase, self).delete(*args, **kwds)
83 # This is a no-op if observer_disabled is set
84 notify_observer(model=self, delete=True, pk=pk, model_dict=model_dict)
86 def save(self, *args, **kwargs):
87 super(PlCoreBase, self).save(*args, **kwargs)
89 # This is a no-op if observer_disabled is set
92 self.__initial = self._dict
94 def save_by_user(self, user, *args, **kwds):
95 if self.can_update(user):
96 self.save(*args, **kwds)
98 def delete_by_user(self, user, *args, **kwds):
99 if self.can_update(user):
100 self.delete(*args, **kwds)
104 return model_to_dict(self, fields=[field.name for field in