async.js parallel not working correctly

Question

I have the following code:

 async.parallel({ one: function(callback) { gps_helper.get_gps(PEMSID, conn, start, stop, function(fullResults){ callback(fullResults); }) }, //query for new dataSet two: function(callback) { admin.getTh(function(gpsThresholds){ callback(gpsThresholds); }) } }, function(results){ console.log(results); console.log('emitting GPS...'); socket.emit('GPS', {gpsResults: results.one, thresholds: results.two, PEMSID: PEMSID, count: count, length: PEMSToDisplay.length, checked: checked}); count++; });

This isn't working, my console displays the first query that finishes in the callback as results. There also is no {one: fullResults, two: gpsThresholds} formatting in the output, it's just displaying the callback value form the respective functions.

adeneo · Accepted Answer · 2014-01-06 19:53:04Z

The first argument of the async callback should be the error object, so it should really be returning null if everything was ok

function(err, results){ console.log(results); console.log('emitting GPS...'); socket.emit('GPS', {gpsResults: results.one, thresholds: results.two, PEMSID: PEMSID, count: count, length: PEMSToDisplay.length, checked: checked}); count++; });

same goes for the callbacks

callback(null, fullResults);

etc, to pass null to the error handler the async callback.
There's an example in the documentation showing exactly how it's done.

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