def METHOD_NAME(self):
    super().METHOD_NAME()
    try:
        self.instance.validate_unique()
    except forms.ValidationError as e:
        self._update_errors(e)
    #
    #         # Passing parameters to forms (w/CBV in comments).
    #         # http://stackoverflow.com/questions/7299973/django-how-to-access-current-request-user-in-modelform
    #