Multiple records for nested/embedded schema is not getting inserted in mongodb, nodejs - node.js

Question

Hi I am new to nodejs and mongodb, I have json file with below structure,
I have defined one shipment schema with the "comments" section as nested schema
{
"buyerId": "B58",
"sellerId": "SL8",
"comments": {
"title": "title5",
"body": "body5",
"date": "12-07-2017"
}
}
I have defined one function like below
exports.post = function(req, res) {
const comments = []
var s = new shipment();
s.sellerId = req.body.sellerId;
s.buyerId = req.body.buyerId;
s.poId = req.body.poId;
s.comments.push({
title: req.body.comments.title,
body: req.body.comments.body,
date: req.body.comments.date
});
s.save(function(err) {
if (err) {
res.send(err);
}
console.log("added");
res.send({
message: 'shipment Created !'
})
})
}
The above 'post' function will work properly when I have only one "comments" section, I mean the data gets properly
inserted into the mongodb as shown below
{
"_id": ObjectId("59689bc59058dbc812000002"),
"buyerId": "B58",
"sellerId": "SL8",
"comments": [{
"title": "title5",
"body": "body5",
"date": ISODate("2017-12-06T18:30:00Z"),
"_id": ObjectId("59689bc59058dbc812000003")
}],
"__v": 0
}
but when I have multiple "comments" section as shown below,
{
"buyerId": "B58",
"sellerId": "SL8",
"comments": [{
"title": "title5",
"body": "body5",
"date": "12-07-2017"
},
{
"title": "title8",
"body": "body7",
"date": "12-07-2017"
}
]
}
then no comments section gets inserted into the mongodb as shown below.
{
"_id": ObjectId("5968c04d4c02336800000002"),
"buyerId": "B57",
"sellerId": "SL7",
"comments": [{
"_id": ObjectId("5968c04d4c02336800000003")
}],
"__v": 0
}
what changes should I do in the function to get all the comments section being inserted into the mongodb properly ?

Answer 1

Instead of assigning value of every property, make instance and pass body directly into it.
const s = new shipment(req.body)
And then when you send data to the request, send in the following format
{ "buyerId": "B58", "sellerId": "SL8", "comments": [{ "title": "title5", "body": "body5", "date": "12-07-2017" }, { "title": "title8", "body": "body7", "date": "12-07-2017" } ] }

Answer 2

I tried like below and it worked.
for( var i = 0; i < req.body.comments.length; i++){
s.comments.push(
{ title: req.body.comments[i].title,
body : req.body.comments[i].body,
date : req.body.comments[i].date });
}

Answer 3

originally comments is an array in the second example comments is an array.
your function
s.comments.push({
title: req.body.comments.title,
body: req.body.comments.body,
date: req.body.comments.date
})
will only work if comments is an object. Put that in a for loop to make it work with arrays like so
for( var i = 0; i < req.body.comments.length; i++){
s.comments.push({
title: req.body.comments[i].title,
body: req.body.comments[i].body,
date: req.body.comments[i].date
})
}