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 class PlCoreBase(models.Model):
21 created = models.DateTimeField(auto_now_add=True)
22 updated = models.DateTimeField(auto_now=True)
23 enacted = models.DateTimeField(null=True, default=None)
29 def __init__(self, *args, **kwargs):
30 super(PlCoreBase, self).__init__(*args, **kwargs)
31 self.__initial = self._dict
37 diffs = [(k, (v, d2[k])) for k, v in d1.items() if v != d2[k]]
41 def has_changed(self):
42 return bool(self.diff)
45 def changed_fields(self):
46 return self.diff.keys()
48 def get_field_diff(self, field_name):
49 return self.diff.get(field_name, None)
51 def can_update(self, user):
58 def delete(self, *args, **kwds):
59 # so we have something to give the observer
61 model_dict = model_to_dict(self)
62 for (k,v) in model_dict.items():
63 # things like datetime are not JSON serializable
64 model_dict[k] = str(v)
66 super(PlCoreBase, self).delete(*args, **kwds)
68 # This is a no-op if observer_disabled is set
69 notify_observer(model=self, delete=True, pk=pk, model_dict=model_dict)
71 def save(self, *args, **kwargs):
72 super(PlCoreBase, self).save(*args, **kwargs)
74 # This is a no-op if observer_disabled is set
77 self.__initial = self._dict
79 def save_by_user(self, user, *args, **kwds):
80 if self.can_update(user):
81 self.save(*args, **kwds)
83 def delete_by_user(self, user, *args, **kwds):
84 if self.can_update(user):
85 self.delete(*args, **kwds)
89 return model_to_dict(self, fields=[field.name for field in