Mongoose async requests managment - node.js

Question

I'm actually trying to convert mongodb references into those references' documents value (info.value) using mongoose in javascript.
Tried that by using map, for/forEach, and nothing did the job since mongoose requests are async.
Not really used to this kind of code, I feel a bit lost after all those things I tried.
Maybe someone would like to give me a hint about this by taking a look at the code below.
Just for information, no need to worry about loading templates, connecting to mongo, ... since everything else is working just fine.
That's the closest I got to the expected result, but still, it throws me errors when I try to "console.log(cond[c]);/console.log(info);" (cond[c] and info are null and undefined)
Well this function also needs to be prepared to be recursive since I plan to put sub-blocks in the "content" property of the bloc objects.
Thanks a lot for your time guys.
// Input condition
"H1Vf3KTef || false"
// Expected result
"1 || false"
// Buggy Function
var execIfBlock = function recursExec (query, callback) {
IfBlockModel.findOne(query, function(err, ifBlock) {
if (!err) {
var cond = ifBlock.condition.split(" ");
//console.log('Block : ' + ifBlock);
//console.log('Condition : ' + cond);
var calls = new Array();
for (var c = 0, len = cond.length; c < len; c++) {
if (shortId.isValid(cond[c])) {
calls.push(function() {
InfoModel.findOne({ _id: cond[c] }, function(err, info) {
console.log(cond[c]);
console.log(info);
cond[c] = info.value;
});
});
}
}
async.parallel(calls, function(err, result) {
console.log(result);
// Do some job using the final expected result : "1 || false"
});
}
});
};
// Info template
{
"_id": "H1Vf3KTef",
"value": "1"
}
// Bloc template
{
"_id": "rkRBtLTef",
"content": [],
"condition": "H1Vf3KTef || false"
}
// Info schema
var InfoSchema = new Schema({
_id: { type: String, unique: true, required: true, default: shortId.generate },
value: { type: String, default: "0" }
});
// Bloc schema
var IfBlockSchema = new Schema({
_id: { type: String, unique: true, required: true, default: shortId.generate },
condition: { type: String, required: true, default: true },
content: [{ type: String, required: true, default: '', ref: 'block' }]
});

Answer 1

Use promises and break your code in small functions :
var execIfBlock = function recursExec(query, callback) {
IfBlockModel.findOne(query, function (err, ifBlock) {
if (!err) {
var cond = ifBlock.condition.split(" ");
updateMultipeInfo(cond)
.then(values => {
console.log(values) // [values1, values ,...]
});
}
});
};
function updateMultipeInfo(cond){
return Promise.all(cond.map(updateInfo))
}
function updateInfo(id){
if (shortId.isValid(id)) {
return InfoModel
.findOne({ _id: id })
.then(info => info.value);
} else {
return Promise.reject("invalid id");
}
}