Loop is not working in node.js - node.js

Question

Here is my code :
for (var j in albums){
var album_images = albums[j].images
var l = album_images.length
for ( var i = 0; i < l; i++ ) {
var image = album_images[i]
Like.findOne({imageID : image._id, userIDs:user._id}, function(err,like){
if(like){
console.log(i)
//console.log(albums[j].images[i])
//albums[j].images[0].userLike = true;
}
})
}
}
Here I have albums, and I am populating images of album
So album variable contains all the albums and inside them their images will also be there in a array
I want to add a extra field (userLike) in each images.
Problem here is all the time the value of the i is 3 (that is the number of images in a album (album_images.length) - for the time being I have only one album)
I think the problem could be because the callback of Like.findOne calls only when all the loops has finished executing (just a guess).
How can I make it work so that I will get all the loop values in console.log(i) ?
Thanks in advance

Answer 1

I prefer using forEach:
albums.forEach(function(album, j) {
var album_images = album.images;
album_images.forEach(function(image, i) {
Like.findOne(...);
});
});
Just a tip: instead of performing a findOne for each image, you may consider using $in.

Answer 2

Alternatively you could define a function in order to have a scope where the variable doesn't change.
...
handle_album_image = function(image, i, j) {
Like.findOne({imageID : image._id, userIDs:user._id}, function(err, like){
if(like){
console.log(i)
//console.log(albums[j].images[i])
//albums[j].images[0].userLike = true;
}
})
}
for ( var i = 0; i < l; i++ ) {
var image = album_images[i]
handle_album_image(image, i, j)
}