code: def register(self, *model_list, **options):
          
          databrowse_class = options.pop('databrowse_class',
                                         DefaultModelDatabrowse)
          for model in model_list:
              if model in self.registry:
                  raise AlreadyRegistered('The model %s is already registered' %
                                          model.__name__)
              self.registry[model] = databrowse_class
docs: Registers the given model(s) with the given databrowse site.
  
          The model(s) should be Model classes, not instances.
  
          If a databrowse class isn't given, it will use DefaultModelDatabrowse
          (the default databrowse options).
  
          If a model is already registered, this will raise AlreadyRegistered.