Async node.js data flow confusion - node.js

Question

thanks for your help...struggling big time with how to handle this properly. I'm in async now, having given up on my ability to write the callbacks properly. I have snippet where I'm passing a set of random numbers (eachrecord) and passing them through to a mongoose call. Trying to create a data set from the multiple queries I pass.
My issue is that no matter what I've done for 4 hours, the "newarray" variable is always empty.
Thank you for your help -
async.forEach(arLimit, function(eachrecord, callback){
newarray = new Array;
var query = UGC_DB_Model.find({}).skip(eachrecord).limit(-1);
query.execFind(function (err, data) {
if (err)
console.log(err);
else {
newarray.push(data);
}
});
callback(null, newarray);
}, function(err, result) {
if (err) return next(err);
console.log("(it's empty): " + result);
});

Answer 1

There are several issues with your code:
async.forEach isn't meant to 'generate' results, that's what async.map is for;
you need to call the callback only when execFind is done, and not immediately after calling it;
your newarray is probably not necessary;
So try this instead:
async.map(arLimit, function(eachrecord, callback){
var query = UGC_DB_Model.find({}).skip(eachrecord).limit(-1);
query.execFind(function (err, data) {
if (err)
callback(err); // pass error along
else {
callback(null, [ data ]);
// although I think you mean this (because 'data' is probably an array already)
// callback(null, data);
}
});
}, function(err, result) {
if (err) return next(err);
console.log("(it's empty): " + result);
});