adding mongodb data value filed using node js - javascript

Hello all I have to need to add two field values {type:Number} of one collection from MongoDB using node js
and store the result in the same collection of MongoDB
1st node js query fetching the data value from MongoDB inside my controller.
2nd trying to add the fetched value.
3rd store the result in the same collection of MongoDB using node js.
1). Node js
var levelScoreQuiz = require('../models/levelscoreSchema.js');
try{
var queryObj = {};
var projection = '-id child.quiz_level.score_pre';
var projection2 = '-id child.quiz_level.score_curr';
var a = levelScoreQuiz.findOne(queryObj,projection);
var b = levelScoreQuiz.findOne(queryObj,projection2);
//console.log(a);
//console.log(b);
var add = a + b;
//console.log(add);
res.send(add);
var userObj = {
level_pre:req.params.add
};
var user = new levelScoreQuiz(userObj);
user.save(function(err, result){
if (err) {
console.log('Error While Saving the reuslt ' +err)}
else{
//console.log("User score saved successfully");
console.log("User Previous score saved successfully");
res.json(result);
}
});
}catch(err){
console.log('Error While Saving the reuslt ' +err);
return next(err);
}
2). MongoDB Schema
var userScore = new Schema({
child: {
quiz_level:{
current_level:{type:Number},
score_pre:{type:Number},
score_curr:{type:Number}
}
}
});
3). Result: it shows me object in my browser
"[object Object][object Object]"

var levelScoreQuiz = require('../models/levelscoreSchema.js');
try{
var queryObj = {};
var projection = {id: 0, 'child.quiz_level.score_pre': 1};
var projection2 = {id: 0, 'child.quiz_level.score_curr': 1};
var a = levelScoreQuiz.findOne(queryObj,projection);
var b = levelScoreQuiz.findOne(queryObj,projection2);
//console.log(a);
//console.log(b);
var add = a.child.quiz_level.score_pre +
b.child.quiz_level.score_curr;
//console.log(add);
res.send(add);
var userObj = {
child: {quiz_level: { score_pre: req.params.add}}
};
var user = new levelScoreQuiz(userObj);
user.save(function(err, result){
if (err) {
console.log('Error While Saving the reuslt ' +err)}
else{
//console.log("User score saved successfully");
console.log("User Previous score saved successfully");
res.json(result);
}
});
}catch(err){
console.log('Error While Saving the reuslt ' +err);
return next(err);
}

Related

NodeJS send response to client only after saving all object to DB

I have the code below, from a REST API, that inserts data in Mysql. I use Node and Express (this is, in fact, my 1st Node project, so please bear in mind I don't understand much about Node).
What I need is that response to client (browser, web application, Postman for testing or whatever access to the API) is returned only when the forEach loop and data insertion into DB terminates, so I get a JSON object with the list error messages, if any.
I've been hitting my head on the wall for half a day, and this is what I got so far.
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On the console, I get this:
INFO Inserting 916311145 for index 0
INFO Inserting 916311146 for index 1
ENDING!!
ERROR 1062 - Duplicate entry '916311145' for key 'phoneNumber_UNIQUE'
ERROR 1062 - Duplicate entry '916311146' for key 'phoneNumber_UNIQUE'
but what I need it to be is:
INFO Inserting 916311145 for index 0
INFO Inserting 916311146 for index 1
ERROR 1062 - Duplicate entry '916311145' for key 'phoneNumber_UNIQUE'
ERROR 1062 - Duplicate entry '916311146' for key 'phoneNumber_UNIQUE'
ENDING!!
Also, when all subscriber objects are saved on DB, I need to return a response to client, something like:
[{"key 0" : "ok"},{"key 1" : "ok"}, {"key 3": "ERROR 1062 - Duplicate entry '916311145' for key 'phoneNumber_UNIQUE'"}...]
and again, the response should only appear when all processing has finished.
How can I get this work?
Hmm try this:
var wait = require('wait.for');
var async = require('async');
var Promise = require('promise');
var Q = require('q');
router.route('/subscriber').post(async (req, res, callback) => {
const data = req.body;
var subscriberCollection = data;
const response = await Promise.all(
subscriberCollection.map(function (value, key) {
var phoneNumber = value.phoneNumber;
var msg = '';
const obj = {};
if (phoneNumber == '') {
msg = 'ERROR missing phoneNumber for subscriber index #' + key + ';Skipping';
console.log(msg);
obj[key] = msg;
Promise.resolve(obj);
return;
}
var sql = 'call insertSubscriber(?)';
console.log('INFO', `Inserting subscriber ${phoneNumber} index ${key}`);
return new Promise((resolve) => {
connection.query(sql, [phoneNumber], function (err, data) {
if (err) {
var msg = 'ERROR' + err.errno + ' - ' + err.sqlMessage;
console.log(msg);
obj[key] = msg;
resolve(obj);
return;
}
obj[key] = 'ok';
resolve(obj);
});
});
}) //end forEach
); //end Promise
console.log('ENDING!!');
res.send(response);
});

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var width = req.param('width');
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I am in a bit of an issue, after fetching a row using query.first(), i want to access the field codeExpiry from by db and compare it with the date and time right now. The fetched date always logs as undefined.
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if (err) {
console.log(err);
return;
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apparray[id]=state;
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console.log(apparray);
context.succeed(apparray);
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rds.describeDBInstances(rdsparams, function(err, data) {
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console.log(err, err.stack);
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I want to return my filtered (apparray) and (rdsarray) back from my functions and perform a calculation on this within the main body of the script. Any ideas on how to do this.
something like
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});
};
and back in the code from you are calling the lambda function
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Is this what you needed? It may be broken but I hope you get the idea of it

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