docs: def get_comment_ids_by_book(self, book_id):
          """Gets the list of Comment Ids associated with a ``Book``.
  
          arg:    book_id (osid.id.Id): ``Id`` of a ``Book``.
          return: (osid.id.IdList) - list of related comment ``Ids``
          raise:  NotFound - ``book_id`` is not found
          raise:  NullArgument - ``book_id`` is ``null``
          raise:  OperationFailed - unable to complete request
          raise:  PermissionDenied - authorization failure
          *compliance: mandatory -- This method must be implemented.*
  
          """
          # Implemented from template for
          # osid.resource.ResourceBinSession.get_resource_ids_by_bin
          id_list = []
          for comment in self.get_comments_by_book(book_id):
              id_list.append(comment.get_id())
          return IdList(id_list)