+ def __init__(self, *args, **kwargs):
+ super(PlCoreBase, self).__init__(*args, **kwargs)
+ self.__initial = self._dict
+
+ @property
+ def diff(self):\r
+ d1 = self.__initial\r
+ d2 = self._dict\r
+ diffs = [(k, (v, d2[k])) for k, v in d1.items() if v != d2[k]]\r
+ return dict(diffs)\r
+\r
+ @property\r
+ def has_changed(self):\r
+ return bool(self.diff)\r
+\r
+ @property\r
+ def changed_fields(self):\r
+ return self.diff.keys()\r
+\r
+ def get_field_diff(self, field_name):\r
+ return self.diff.get(field_name, None)\r
+\r
+ def save(self, *args, **kwargs):\r
+ super(PlCoreBase, self).save(*args, **kwargs)\r
+ self.__initial = self._dict
+
+ @property
+ def _dict(self):\r
+ return model_to_dict(self, fields=[field.name for field in\r
+ self._meta.fields])
+