Parse : Multiple queries with an array returning only when finished

Question

trying CloudCode out for the first time and loving it.

I am writing an iOS app that passes phone numbers to CloudCode to see if a phone number already has the app.

The problem is its firing the success block before the queries finish. I am guessing I need to know how many queries there are and work out if on the last one? I also seen this .then function?

Parse.Cloud.define("processNumbers", function(request, response) {

    Parse.Cloud.useMasterKey();
    var phoneNumbers = request.params.phoneNumbers;

    phoneNumbers.forEach(function(entry) {

        var query = new Parse.Query(Parse.User);
        //query.equalTo("username", entry);

        query.find({
            success: function(results) {
                console.log("has app");

            },
            error: function() {
                console.log("not found");

             }
        }); 

        console.log(entry);

    });

    response.success(phoneNumbers);
});

mido · Accepted Answer · 2015-10-07 09:30:01Z

4

You could do use promise to perform task in series or parallel.

ref. Promises in Parallel, Promises in Series

The following is a parallel version which use Parse.Promise.when. The promise when will be resolved when all of its input promises is resolved.

Parse.Cloud.define("processNumbers", function(request, response) {

    Parse.Cloud.useMasterKey();
    var phoneNumbers = request.params.phoneNumbers;
    var promises = [];

    phoneNumbers.forEach(function(entry) {

        var query = new Parse.Query(Parse.User);
        //query.equalTo("username", entry);

        promise.push(
            query.find().then(function(results) {
                console.log("has app");

            }, function() {
                console.log("not found");

            });
        ) 

        console.log(entry);

    });
    return Parse.Promise
        .when(promises)
        .then(function() {
            response.success(phoneNumbers);
        });

    response.success(phoneNumbers);
});

p.s. not tested yet, use at your own risk

edited Oct 7, 2015 at 9:30

mido

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answered Nov 19, 2014 at 18:47

eth3lbert

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1 Comment

Chris Conover Over a year ago

is there anything else that you have to do when the inner promises (in the array) are themselves queries that return a result? I can get it to work when I return .as(something), but not when adding a nested promise: stackoverflow.com/questions/35832955/…. Thanks!

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