code: def register(self, model, related=None):
          '''Register a :class:`StdModel` with this search :class:`SearchEngine`.
  When registering a model, every time an instance is created, it will be
  indexed by the search engine.
  
  :param model: a :class:`StdModel` class.
  :param related: a list of related fields to include in the index.
  '''
          update_model = UpdateSE(self, related)
          self.REGISTERED_MODELS[model] = update_model
          self.router.post_commit.bind(update_model, model)
          self.router.post_delete.bind(update_model, modelf register(self, model, related=None):
          '''Register a :class:`StdModel` with this search :class:`SearchEngine`.
  When registering a model, every time an instance is created, it will be
  indexed by the search engine.
  
  :param model: a :class:`StdModel` class.
  :param related: a list of related fields to include in the index.
  '''
          update_model = UpdateSE(self, related)
          self.REGISTERED_MODELS[model] = update_model
          self.router.post_commit.bind(update_model, model)
          self.router.post_delete.bind(update_model, model)
docs: Register a :class:`StdModel` with this search :class:`SearchEngine`.
  When registering a model, every time an instance is created, it will be
  indexed by the search engine.
  
  :param model: a :class:`StdModel` class.
  :param related: a list of related fields to include in the index.