code: def format_content_type(repo, content_type):
      
      storage_manager = StorageManager(repo)
      model_class = load_model_class(repo, content_type)
      return [dict(model_obj)
              for model_obj in storage_manager.iterate(model_class)]
docs: Return a list of all content objects for a given content type
      in a repository.
  
      :param Repo repo:
          The git repository.
      :param str content_type:
          The content type to list
      :returns: list