def get_model_indices(cls, index):
        '''
        Returns the list of model indices (i.e. ModelIndex objects) defined for this index.
        :param index: index name.
        '''
        try:
            return cls._idx_name_to_mdl_to_mdlidx[index].values()
        except KeyError:
            raise KeyError('Could not find any index named {}. Is this index defined in BUNGIESEARCH["INDICES"]?'.format(index))