private static Set<String> convertIds(final ResourceDO resourceDO) {
        Set<String> idSet = new HashSet<>();
        idSet.add(resourceDO.getId());
        return idSet;
    }
convert the list to a map, the key is the parent id, and the value is the set of child ids.

@param metaList the list to be converted
@return the map
shenyu-admin/src/main/java/org/apache/shenyu/admin/utils/ResourceUtil.java