code: def bulk_change_and_save(iterable, update_only_changed_fields=False, save_kwargs=None, **changed_fields):
      
      return [
          change_and_save(obj, update_only_changed_fields=update_only_changed_fields, save_kwargs=save_kwargs,
                          **changed_fields)
          for obj in iterable
      ]
docs: Changes a given `changed_fields` on each object in a given `iterable`, saves objects
      and returns the changed objects.