planetstack/core/models/plcorebase.py

   1 import os
   2 from django.db import models
   3 from django.forms.models import model_to_dict
   4 from openstack.event_manager import EventSender
   5
   6
   7 class PlCoreBase(models.Model):
   8
   9     created = models.DateTimeField(auto_now_add=True)
  10     updated = models.DateTimeField(auto_now=True)
  11
  12     class Meta:
  13         abstract = True
  14         app_label = "core"
  15
  16     def __init__(self, *args, **kwargs):
  17         super(PlCoreBase, self).__init__(*args, **kwargs)
  18         self.__initial = self._dict
  19
  20     @property
  21     def diff(self):
  22         d1 = self.__initial
  23         d2 = self._dict
  24         diffs = [(k, (v, d2[k])) for k, v in d1.items() if v != d2[k]]
  25         return dict(diffs)
  26
  27     @property
  28     def has_changed(self):
  29         return bool(self.diff)
  30
  31     @property
  32     def changed_fields(self):
  33         return self.diff.keys()
  34
  35     def get_field_diff(self, field_name):
  36         return self.diff.get(field_name, None)
  37
  38     def save(self, *args, **kwargs):
  39         super(PlCoreBase, self).save(*args, **kwargs)
  40
  41         # Tell the observer that the source database has been updated
  42         EventSender().fire()
  43
  44         self.__initial = self._dict
  45
  46     @property
  47     def _dict(self):
  48         return model_to_dict(self, fields=[field.name for field in
  49                              self._meta.fields])
  50
  51
  52