3 from django.db import models
4 from django.forms.models import model_to_dict
5 from django.core.urlresolvers import reverse
6 from django.forms.models import model_to_dict
9 # This is a no-op if observer_disabled is set to 1 in the config file
10 from observer import *
12 print "import of observer failed! printing traceback and disabling observer:"
16 # guard against something failing
17 def notify_observer(*args, **kwargs):
20 class PlCoreBase(models.Model):
22 # default values for created and updated are only there to keep evolution
25 created = models.DateTimeField(auto_now_add=True, default=datetime.datetime.now())
26 updated = models.DateTimeField(auto_now=True, default=datetime.datetime.now())
27 enacted = models.DateTimeField(null=True, default=None)
33 def __init__(self, *args, **kwargs):
34 super(PlCoreBase, self).__init__(*args, **kwargs)
35 self.__initial = self._dict
41 diffs = [(k, (v, d2[k])) for k, v in d1.items() if v != d2[k]]
45 def has_changed(self):
46 return bool(self.diff)
49 def changed_fields(self):
50 return self.diff.keys()
52 def get_field_diff(self, field_name):
53 return self.diff.get(field_name, None)
55 def can_update(self, user):
62 def delete(self, *args, **kwds):
63 # so we have something to give the observer
65 model_dict = model_to_dict(self)
66 for (k,v) in model_dict.items():
67 # things like datetime are not JSON serializable
68 model_dict[k] = str(v)
70 super(PlCoreBase, self).delete(*args, **kwds)
72 # This is a no-op if observer_disabled is set
73 notify_observer(model=self, delete=True, pk=pk, model_dict=model_dict)
75 def save(self, *args, **kwargs):
76 super(PlCoreBase, self).save(*args, **kwargs)
78 # This is a no-op if observer_disabled is set
81 self.__initial = self._dict
83 def save_by_user(self, user, *args, **kwds):
84 if self.can_update(user):
85 self.save(*args, **kwds)
87 def delete_by_user(self, user, *args, **kwds):
88 if self.can_update(user):
89 self.delete(*args, **kwds)
93 return model_to_dict(self, fields=[field.name for field in