2 from django.db import models
3 from django.forms.models import model_to_dict
4 from django.core.urlresolvers import reverse
5 from django.forms.models import model_to_dict
8 # This is a no-op if observer_disabled is set to 1 in the config file
11 print "import of observer failed! printing traceback and disabling observer:"
15 # guard against something failing
16 def notify_observer():
19 # This manager will be inherited by all subclasses because
20 # the core model is abstract.
21 class PlCoreBaseManager(models.Manager):
22 def get_query_set(self):
23 return super(PlCoreBaseManager, self).get_query_set().filter(deleted=False)
25 class PlCoreBase(models.Model):
26 objects = PlCoreBaseManager()
27 created = models.DateTimeField(auto_now_add=True)
28 updated = models.DateTimeField(auto_now=True)
29 enacted = models.DateTimeField(null=True, default=None)
30 backend_status = models.CharField(max_length=140,
31 default="Provisioning in progress")
32 deleted = models.BooleanField(default=False)
35 # Changing abstract to False would require the managers of subclasses of
36 # PlCoreBase to be customized individually.
40 def __init__(self, *args, **kwargs):
41 super(PlCoreBase, self).__init__(*args, **kwargs)
42 self.__initial = self._dict
48 diffs = [(k, (v, d2[k])) for k, v in d1.items() if v != d2[k]]
52 def has_changed(self):
53 return bool(self.diff)
56 def changed_fields(self):
57 return self.diff.keys()
59 def get_field_diff(self, field_name):
60 return self.diff.get(field_name, None)
62 def can_update(self, user):
69 def delete(self, *args, **kwds):
70 # so we have something to give the observer
72 model_dict = model_to_dict(self)
73 for (k,v) in model_dict.items():
74 # things like datetime are not JSON serializable
75 model_dict[k] = str(v)
77 super(PlCoreBase, self).delete(*args, **kwds)
79 # This is a no-op if observer_disabled is set
80 notify_observer(model=self, delete=True, pk=pk, model_dict=model_dict)
82 def save(self, *args, **kwargs):
83 super(PlCoreBase, self).save(*args, **kwargs)
85 # This is a no-op if observer_disabled is set
88 self.__initial = self._dict
90 def save_by_user(self, user, *args, **kwds):
91 if self.can_update(user):
92 self.save(*args, **kwds)
94 def delete_by_user(self, user, *args, **kwds):
95 if self.can_update(user):
96 self.delete(*args, **kwds)
100 return model_to_dict(self, fields=[field.name for field in