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 class PlCoreBase(models.Model):
23 # default values for created and updated are only there to keep evolution
26 created = models.DateTimeField(auto_now_add=True, default=datetime.datetime.now())
27 updated = models.DateTimeField(auto_now=True, default=datetime.datetime.now())
28 enacted = models.DateTimeField(null=True, default=None)
29 backend_status = models.CharField(max_length=140,
30 default="Provisioning in progress")
31 deleted = models.BooleanField(default=False)
37 def __init__(self, *args, **kwargs):
38 super(PlCoreBase, self).__init__(*args, **kwargs)
39 self.__initial = self._dict
45 diffs = [(k, (v, d2[k])) for k, v in d1.items() if v != d2[k]]
49 def has_changed(self):
50 return bool(self.diff)
53 def changed_fields(self):
54 return self.diff.keys()
56 def get_field_diff(self, field_name):
57 return self.diff.get(field_name, None)
59 def can_update(self, user):
66 def delete(self, *args, **kwds):
67 # so we have something to give the observer
69 model_dict = model_to_dict(self)
70 for (k,v) in model_dict.items():
71 # things like datetime are not JSON serializable
72 model_dict[k] = str(v)
74 super(PlCoreBase, self).delete(*args, **kwds)
76 # This is a no-op if observer_disabled is set
77 notify_observer(model=self, delete=True, pk=pk, model_dict=model_dict)
79 def save(self, *args, **kwargs):
80 super(PlCoreBase, self).save(*args, **kwargs)
82 # This is a no-op if observer_disabled is set
85 self.__initial = self._dict
87 def save_by_user(self, user, *args, **kwds):
88 if self.can_update(user):
89 self.save(*args, **kwds)
91 def delete_by_user(self, user, *args, **kwds):
92 if self.can_update(user):
93 self.delete(*args, **kwds)
97 return model_to_dict(self, fields=[field.name for field in