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)
34 def __init__(self, *args, **kwargs):
35 super(PlCoreBase, self).__init__(*args, **kwargs)
36 self.__initial = self._dict
42 diffs = [(k, (v, d2[k])) for k, v in d1.items() if v != d2[k]]
46 def has_changed(self):
47 return bool(self.diff)
50 def changed_fields(self):
51 return self.diff.keys()
53 def get_field_diff(self, field_name):
54 return self.diff.get(field_name, None)
56 def can_update(self, user):
63 def delete(self, *args, **kwds):
64 # so we have something to give the observer
66 model_dict = model_to_dict(self)
67 for (k,v) in model_dict.items():
68 # things like datetime are not JSON serializable
69 model_dict[k] = str(v)
71 super(PlCoreBase, self).delete(*args, **kwds)
73 # This is a no-op if observer_disabled is set
74 notify_observer(model=self, delete=True, pk=pk, model_dict=model_dict)
76 def save(self, *args, **kwargs):
77 super(PlCoreBase, self).save(*args, **kwargs)
79 # This is a no-op if observer_disabled is set
82 self.__initial = self._dict
84 def save_by_user(self, user, *args, **kwds):
85 if self.can_update(user):
86 self.save(*args, **kwds)
88 def delete_by_user(self, user, *args, **kwds):
89 if self.can_update(user):
90 self.delete(*args, **kwds)
94 return model_to_dict(self, fields=[field.name for field in