docs: def save(self, *args, **kwargs):
          """
          Set default for ``publish_date``. We can't use ``auto_now_add`` on
          the field as it will be blank when a blog post is created from
          the quick blog form in the admin dashboard.
          """
          if self.publish_date is None:
              self.publish_date = now()
          super(Displayable, self).save(*args, **kwargs)