def save(self, *args, **kwargs):
        """
        Custom save method does the following:
            * save shortcuts if HSTORE is enabled
        """
        if 'node' not in self.shortcuts:
            self.shortcuts['node'] = self.device.node

        if 'user' not in self.shortcuts and self.device.node.user:
            self.shortcuts['user'] = self.device.node.user

        if 'layer' not in self.shortcuts and 'nodeshot.core.layers' in settings.INSTALLED_APPS:
            self.shortcuts['layer'] = self.device.node.layer

        super(Interface, self).save(*args, **kwargs)
Custom save method does the following:
            * save shortcuts if HSTORE is enabled