Mongoose create a subobject in a subobject - node.js

Question

I want to create a subdocument in a subobject field, not to update.
My Schema:
var DemandeSchema = new Schema({
titre: {
type: String,
required: true
},
description: {
type: String,
required: true
},
type: {
type: String,
required: true
},
answer: {}
});
My code:
demande.update(
{ name: 'answer' },
{ $push: req.body.answer },
{ upsert: true },
function(error, user) {
if (error) return next(error);
else {
return true;
}
}
)
req.body.answer = {
"id": "57f512f4360d8818a4e5ea3d",
"answer": {
"122547eee99" : {
"review" : "1.3",
"login" : "new"
}
}
}
But this code doesn't create a new field in my DB, it just updates the field answer when I just want to create a new object field in the answer field.
Actual Result:
{
"_id" : ObjectId("57f512f4360d8818a4e5ea3d"),
"titre" : "TEST",
"description" : "ee",
"type" : "ee",
"__v" : 0,
"answer" : {
"122547eee98" : {
"review" : "8.8",
"login" : "x"
}
}
}
Expected Result:
{
"_id" : ObjectId("57f512f4360d8818a4e5ea3d"),
"titre" : "TEST",
"description" : "ee",
"type" : "ee",
"__v" : 0,
"answer" : {
"122547eee98" : {
"review" : "8.8",
"login" : "x"
},
"122547eee99" : {
"review" : "1.3",
"login" : "new"
}
}
}

Answer 1

var DemandeSchema = new Schema({
titre: {
type: String,
required: true
},
description: {
type: String,
required: true
},
type: {
type: String,
required: true
},
answer: []
});
Answer field curly braces would convert to square brackets for pushing all new answers.
Conclusion: It creates an array.

Answer 2

Instead of the $push operator which works on arrays, use the $set operator together with the dot notation to set the subdocument in the embedded answer document.
You would need to preprocess the document to use in your update so that it will have the dot notation. The following mongo shell example demonstrates this:
var obj = {
"id": "57f512f4360d8818a4e5ea3d",
"answer": {
"122547eee99" : {
"review" : "1.3",
"login" : "new"
}
}
},
update = {};
var key = Object.keys(obj.answer)[0]; // get the dynamic key "122547eee99"
update["answer."+key] = obj.answer[key]; // create the update object with dot notation
/*
update = {
"answer.122547eee99": {
"review" : "1.3",
"login" : "new"
}
}
*/
db.demandes.update(
{ "_id" : ObjectId(obj.id)},
{ "$set": update },
{ "upsert": true }
)
Using the same concept as above, you can create the documents to use in your update as follows:
var update = {},
key = Object.keys(req.body.answer.answer)[0]; // get the dynamic key "122547eee99"
// create the update object with dot notation
update["answer."+key] = req.body.answer.answer[key];
demande.update(
{ "_id": req.body.answer.id },
{ $set: update },
{ upsert: true },
function(error, user) {
if (error) return next(error);
else {
return true;
}
}
);

Answer 3

Try this, and in schema answer: [],
demande.findOne( { name: 'answer' }, function(err, result){
result.answer.push({ans:req.body.answer})
var dem = new Demande(result); // Demande is ur mongoose schema model,
dem.save(function(err, result){
console.log(result);
});
})