code: def register_model(self, key, *models, **kwargs):
          
  
          cache_group = CacheGroup(key)
          for model in models:
              cache_group.register(model, **kwargs)
  
          self.register_cache(cache_group)
docs: Register a cache_group with this manager.
  
          Use this method to register more simple
          groups where all models share the same parameters.
  
          Any arguments are treated as models that you would like
          to register.
  
          Any keyword arguments received are passed to the
          register method when registering each model.
  
          :param key: The key to register this group as. \
          Raises an exception if the key is already registered.