import os
from django.db import models
+from django.forms.models import model_to_dict
+# This is a no-op if observer_disabled is set to 1 in the config file
+from observer import *
class PlCoreBase(models.Model):
created = models.DateTimeField(auto_now_add=True)
updated = models.DateTimeField(auto_now=True)
+ enacted = models.DateTimeField(null=True, default=None)
class Meta:
abstract = True
app_label = "core"
+ def __init__(self, *args, **kwargs):
+ super(PlCoreBase, self).__init__(*args, **kwargs)
+ self.__initial = self._dict
+
+ @property
+ def diff(self):
+ d1 = self.__initial
+ d2 = self._dict
+ diffs = [(k, (v, d2[k])) for k, v in d1.items() if v != d2[k]]
+ return dict(diffs)
+
+ @property
+ def has_changed(self):
+ return bool(self.diff)
+
+ @property
+ def changed_fields(self):
+ return self.diff.keys()
+
+ def get_field_diff(self, field_name):
+ return self.diff.get(field_name, None)
+
+ def delete(self, *args, **kwds):
+ super(PlCoreBase, self).delete(*args, **kwds)
+
+ # This is a no-op if observer_disabled is set
+ notify_observer(model=self, delete=True)
+
+ def save(self, *args, **kwargs):
+ super(PlCoreBase, self).save(*args, **kwargs)
+
+ # This is a no-op if observer_disabled is set
+ notify_observer()
+
+ self.__initial = self._dict
+
+ @property
+ def _dict(self):
+ return model_to_dict(self, fields=[field.name for field in
+ self._meta.fields])
+