Path.es6

    Path.find = function (filter, options, callback) {
      var PrivMgr = app.PrivilegeManager;
      if (!callback) {
        callback = options;
      }
      callback = callback || ldjutils.createPromiseCallback();
      var cfg = Path.app.get('cache');
      var _memCache = cacheManager.caching(cfg);
      var key = `path_${JSON.stringify(filter)}`;
      _memCache.wrap(key, (cacheCallback) => {
        var userId = parseInt(_.get(options, 'remoteCtx.req.accessToken.userId'));
        if (!userId) {
          var ctx = app.loopback.getCurrentContext();
          if (ctx) {
            var accessToken = ctx.get('accessToken');
            if (accessToken) {
              userId = accessToken.userId;
            }
          }
        }
        if (!userId) {
          return callback('no user context');
        }

        debug('userId', userId);

        var flags, type;
        if (_.has(filter, 'where.id')) {
          var parsed = utils.parseId(filter.where.id);
          type = parsed.realtype;
        } else {
          type = _.get(filter, 'where.type');
        }
        switch (type) {
        case 'media':
          flags = PrivMgr.FLAGS.PP_DISPLAY_MEDIA_MANAGER;
          break;
        case 'playlist':
          flags = PrivMgr.FLAGS.PP_DISPLAY_BLOCK_MANAGER;

          break;
        default:
          flags = PrivMgr.FLAGS.PP_RO;
        }

        PrivMgr.listGroupsWithPriv({
          userId,
          flags
        }, (err, groups) => {
          findFn(filter, options, userId, groups, cacheCallback);
        });

      }, callback);
      return callback.promise;
    };