Parse.com Query Inside of Loop

Question

Heres's what I'm trying to do:

Get an array named RecentPlayers containing 4 objectId's - This is working.
Run a query for each of those objectId's to find their corresponding "name" (string). - Not Working.
Put these names into a new array, unimaginatively named names. - This should work once #2 works.

The Code:

$(document).ready(function _RP(){
//Our objectId's array
var recentlyPlayed = Parse.User.current().get("RecentPlayers");
//Our names array
var names = [];
//Converting
var User = Parse.Object.extend("User");
var query = new Parse.Query(User);
for (var j = 0; j < recentlyPlayed.length; j++) {
        query.equalTo("objectId", recentlyPlayed[j]);
        query.find({
            success: function(results) {
                var name = results[j].get("name");
                    console.log(name);
                names.push(name);
            },
            error: function(error) {
                alert("Error: " + error.code + " " + error.message);
            }
        });
    }
names = names.sort();

The error:

var name = results[j].get("name");

Console:

(4) Uncaught TypeError: Cannot read property 'get' of undefined
query.find.succes
(anonymous function)
e 
(anonymous function)
x.each.x.forEach
c.extend.resolve
e
(anonymous function)
x.each.x.forEach
c.extend.resolve
e
(anonymous function)
x.each.x.forEach
c.extend.resolve
(anonymous function) 
e
(anonymous function)
g
c.extend.then
e
(anonymous function)
x.each.x.forEach
c.extend.resolve
j.onreadystatechange

I'm guessing this has to do with Parse.com's asynchronous nature. Thanks for your help!

eth3lbert · Accepted Answer · 2014-12-13 09:37:50Z

1

In this case, query.containedIn might be a more suitable constraint. Try the following code snippet:

var query = new Parse.Query(Parse.User);
query.containedIn("objectId", recentlyPlayed);
query.find().then(function(users) {
   for(var i=0; i < users.length; i++) {
       names.push(users[i].get("name"));
   }
    names.sort();
});

edited Dec 13, 2014 at 9:37

answered Dec 12, 2014 at 1:17

eth3lbert

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1 Comment

Will Over a year ago

That handled the error message, and the function appears to be working properly now, except there are no results returned.

Will · Accepted Answer · 2014-12-12 17:44:25Z

0

Thanks, eth3lbert, just needed to set i=0 and users[i] in name.push.

var query = new Parse.Query(User);
        query.containedIn("objectId", recentlyPlayed);
        query.find().then(function(users) {
            for (var i=0; i < users.length; i++) {
                names.push(users[i].get("name"));
            }   
names = names.sort();

answered Dec 12, 2014 at 17:44

Will

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