Mongoose - replace all array elements - node.js

Question

I want to replace all array's elements in 'prices' filed as below:
{
"name": "My customer name"
"taxCode":123456
"prices":
[
{
"name": "Chocolate",
"unitPrice": 10
},
{
"name": "Cookie",
"unitPrice": 9
}
]
}
The JSON that uses to change 'prices' is:
{
"prices":
[
{
"name": "Chocolate1",
"unitPrice": 10
},
{
"name": "Candy",
"unitPrice": 5
}
]
}
And here is my code to replace the 'prices' array
router.route('/:obj/:id')
.put((req, res) => {
const PObj = require('../models/customer');
PObj.findById(req.params.id, (err, doc) => {
if (err) {
console.log('Lookup error: ' + err);
res.status(500).send('Error');
} else if (doc) {
doc.update({$set: req.body}, (err, task) => {
res.status(200).json(task);
}); } else {
res.status(404).send('Something is wrong');
}
});
});
After code executed is done but without any changes in Mongo DB. Please help me to correct my code. Thank!

Answer 1

If your req.body prints that prices array then it has to be req.body.prices, also rather than fetching the document & updating it - Which is a two- way process, You can try this :
router.route("/:obj/:id").put((req, res) => {
const PObj = require("../models/customer");
PObj.findByIdAndUpdate(
req.params.id, /** this 'req.params.id' has to be `_id` value of doc in string format */
/** internally mongoose will send this as { $set: { prices: req.body.prices }} which will replace `prices` array will new array,
* Just in case if you wanted to push new values, have to manually do { $push: { prices: req.body.prices }} each object */
{ prices: req.body.prices },
{ new: true }, /** returns updated doc, this option is not needed if you don't need doc - by default it returns old doc */
(err, doc) => {
if (err) {
console.log("Lookup error: " + err);
res.status(500).send("Error");
} else if (doc) {
res.status(200).json(task);
} else { /** `doc` value will be null if no doc is not found for given id */
res.status(404).send("Something is wrong");
}
}
);
});
Ref : .findByIdAndUpdate()