docs: def _to_dict(self):
          """Return a json dictionary representing this model."""
          _dict = {}
          if hasattr(self, 'generic') and self.generic is not None:
              _dict['generic'] = [x._to_dict() for x in self.generic]
          if hasattr(self, 'intents') and self.intents is not None:
              _dict['intents'] = [x._to_dict() for x in self.intents]
          if hasattr(self, 'entities') and self.entities is not None:
              _dict['entities'] = [x._to_dict() for x in self.entities]
          if hasattr(self, 'actions') and self.actions is not None:
              _dict['actions'] = [x._to_dict() for x in self.actions]
          if hasattr(self, 'debug') and self.debug is not None:
              _dict['debug'] = self.debug._to_dict()
          if hasattr(self, 'user_defined') and self.user_defined is not None:
              _dict['user_defined'] = self.user_defined
          return _dict