javascript - Defining array of values in Collection in Meteor -

i have defined following collection in application:

projects = new mongo.collection("projects") 

in collection, have inserted:

projects.insert({     source: "https://upload.wikimedia.org/wikipedia/commons/7/7f/pug_portrait.jpg",     title: "pug",     artist: "pug",     description: "this piece shows duality of pug",     price: "priceless" });  projects.insert({     source: "http://i.stack.imgur.com/d2abd.gif",     title: "doge",     artist: "doge",     description: "much doge, many deal it, wow",     price: "bout tree fiddy" }) 

i attempting create array of sources of images using following helper function:

sourcearray : function () {           // returns array of sources           var sources = [];           (var = 0; < projects.find().count(); i++) {             sources.push(images[i].source);           }           return sources;        } 

the "images variable defined as: images = projects.find().fetch();

i call helper function in html.

<p>{{sourcearray}}</p> 

on page, first source appears fleetingly, disappears within few seconds. in browser console following shown:

meteor.js:888 exception in template helper: typeerror: cannot read property 'source' of undefined     @ object.template.body.helpers.sourcearray (http://localhost:3000/art.js?913b8578eb54cde21abc07c994f6b29267232bc5:61:28)     @ http://localhost:3000/packages/blaze.js?a5c324925e5f6e800a4c618d71caf2848b53bf51:2880:16     @ http://localhost:3000/packages/blaze.js?a5c324925e5f6e800a4c618d71caf2848b53bf51:1651:16     @ http://localhost:3000/packages/blaze.js?a5c324925e5f6e800a4c618d71caf2848b53bf51:2928:66     @ function.template._withtemplateinstancefunc (http://localhost:3000/packages/blaze.js?a5c324925e5f6e800a4c618d71caf2848b53bf51:3476:12)     @ http://localhost:3000/packages/blaze.js?a5c324925e5f6e800a4c618d71caf2848b53bf51:2927:27     @ spacebars.call (http://localhost:3000/packages/spacebars.js?7bafbe05ec09b6bbb6a3b276537e4995ab298a2f:172:18)     @ spacebars.mustacheimpl (http://localhost:3000/packages/spacebars.js?7bafbe05ec09b6bbb6a3b276537e4995ab298a2f:109:25)     @ object.spacebars.mustache (http://localhost:3000/packages/spacebars.js?7bafbe05ec09b6bbb6a3b276537e4995ab298a2f:113:39)     @ null._render (http://localhost:3000/template.art.js?30aa5e2d0b6d3de2f69b7341296ae51b8ce737ba:27:22) 

the exception refers line of code:

sources.push(images[i].source); 

how can fixed?

try:

sourcearray : function () {       var images = projects.find().fetch();        var sources = [];       (var = 0; < images.length; i++) {         sources.push(images[i].source);       }       return sources;    } 

if said, defined images template helper property, may need

this.images[i].source