array schema store empty values - arrays

Question

I want store values in mongodb using node controller but it will store an empty array inside mongodb
1).This is node controller using to accept the req parameter
this.childQuestionId = function(req, res, next){
try{
var userObj = {
'child.quiz.questionId' : req.params.questionId,
'child.quiz.score' : req.params.score,
//'child.quiz.time' : req.params.time
'child.quiz.time' : new Date().toISOString()
};
var childupdate = new childQuiz(userObj);
childupdate.save(function(err,data){
if(err) return next(err);
console.log("Data saved successfully");
res.send(data);
});
}catch(err){
console.log('Error While Saving the result ' +err);
return next(err);
}
}
2).This is mongodb schema using to store the value. Here i am using array quiz schema to store values is array
child:{
quiz:[
{
/*questionId:{
type: mongoose.Schema.Types.ObjectId,
ref: 'commonquestions'
},*/
questionId:{type:String},
score:{type:Number},
time:{type:String}
}
]
}
3).This is my json result sending values using postman
{
"__v": 0,
"_id": "57a43ec68d90b13a7b84c58f",
"child": {
"quiz": []
}
}

Answer 1

MongoDB save() function accepts 2 parameters, document and data, but in your code, you use a callback function. Should you check it out?
https://docs.mongodb.com/manual/reference/method/db.collection.save/#db.collection.save

Answer 2

Try with this code in your controller
this.childQuestionId = function(req, res, next){
try{
var userObj = {
'questionId' : req.params.questionId,
'score' : req.params.score,
//'time' : req.params.time
'time' : new Date().toISOString()
};
var childupdate = new childQuiz();
childupdate.quiz.push(userObj);
childupdate.save(function(err){
if(err) return next(err);
console.log("Data saved successfully");
res.send(childupdate);
});
}catch(err){
console.log('Error While Saving the result ' +err);
return next(err);
}
}