ParseSever LiveQuery: expressjs call save but get error "Can not find subscriptions under this class XXX"

[uluru-phatnguyen]

Step 1: Build parser-server config in index.js

var api = new ParseServer({
  databaseURI: 'mongodb://localhost:27017/dev',
  cloud: process.env.CLOUD_CODE_MAIN || __dirname + '/cloud/main.js',
  appId: process.env.APP_ID || 'myAppId',
  masterKey: process.env.MASTER_KEY || '', //Add your master key here. Keep it secret!
  serverURL: process.env.SERVER_URL || 'http://localhost:1337/parse',  // Don't forget to change to https if needed
  liveQuery: {
    classNames: ['XXX'] // List of classes to support for query subscriptions
  },
  // ....
});

var port = process.env.PORT || 1337;
var httpServer = require('http').createServer(app);
httpServer.listen(port, function() {
    console.log('server running on port ' + port + '.');
});

// This will enable the Live Query real-time server
ParseServer.createLiveQueryServer(httpServer);

Step 2: Build webapp by expressjs framework

Call api (above server) to update data of XXX via ParseQuery.

But i always get bug logs from server "Can not find subscriptions under this class XXX"

https://github.com/ParsePlatform/parse-server/blob/master/src/LiveQuery/ParseLiveQueryServer.js#L154-L158

I don't know how to fix, If have any solution pls tell me.

[flovilmart]

Do you have a client subscribed to those updates?

[flavionegrao]

Maybe changing the log level to debug would be more appropriated?

// ParseLiveQueryServer.js (_onAfterSave and _onAfterSave)

   var classSubscriptions = this.subscriptions.get(className);
      if (typeof classSubscriptions === 'undefined') {
        _logger2.default.error('Can not find subscriptions under this class ' + className);
        return;
      }

I believe the situation is a class is being tracked by the Live Query Server, but no client is subscribed to it.

this.subscription
ParseLiveQueryServer
clientId:0
clients:Map[0]
keyPairs:Map[0]
parseWebSocketServer:ParseWebSocketServer
sessionTokenCache:SessionTokenCache
subscriber:Subscriber
subscriptions:Map[0]
proto:ParseLiveQueryServer

[flovilmart]

That would make sense. Do you mind opening a pull request for that fix?

https://github.com/ParsePlatform/parse-server/blob/master/src/LiveQuery/ParseLiveQueryServer.js#L111

https://github.com/ParsePlatform/parse-server/blob/master/src/LiveQuery/ParseLiveQueryServer.js#L156

And probably other places in this module

[flavionegrao]

sure thing

[flovilmart]

Thanks @flavionegrao ! Let's close that one as it will be part of next release.