how to update an object of an element in array in mongodb? - node.js

Question

This is the structure i have, i want to update the nested array element if an object key matches for example - i want to match grnno :"10431000" and update the other keys of that object like vehicle_no,invoice_no etc.
{
"_id" : ObjectId("5f128b8aeb27bb63057e3887"),
"requirements" : [
{
"grns" : [
{
"invoice_no" : "123",
"vehicle_no" : "345",
"req_id" : "5f128c6deb27bb63057e388a",
"grnno" : "10431000"
},
{
"invoice_no" : "abc",
"vehicle_no" : "def",
"req_id" : "5f128c6deb27bb63057e388a",
"grnno" : "10431001"
}
]
}
]
}
I have tried this code
db.po_grn.update({
"requirements.grns.grnno":"10431001"
}, {
$set: {
"requirements.$.grns": {"invoice_no":"test",vehicle_no:"5455"}
}
})
But this is changing the structure i have like this
"requirements" : [
{
"grns" : {
"invoice_no" : "test",
"vehicle_no":"5455"
},
"req_id" : ObjectId("5f128b8aeb27bb63057e3886")
}
],
grns key should be array, and update should be of the particular object which matches the key "grnno". Please help me out. Thanks.
==Edit==
var grnno = req.body.grnno;
db.po_grn.find({
"requirements.grns.grnno":grnno
}).toArray(function(err, po_grn) {
console.log("po_grn",po_grn);
if (po_grn.length > 0) {
console.log("data.grn.grnno ", grnno);
var query = {
requirements: {
$elemMatch: {
"grns.grnno": grnno
}
}
};
var update = {
$set: {
'requirements.$[].grns.$[inner].invoice_no': data.invoice_no,
'requirements.$[].grns.$[inner].vehicle_no': data.vehicle_no,
}
};
var options = {
arrayFilters: [
{ "inner.grnno" : grnno }
]
};
db.po_grn.update(query, update, options
, function(er, grn) {
console.log("grn",grn,"er",er)
res.send({
status: 1,
message: "Grn updated successfully"
});
}
);
} else {
res.send({
status: 0,
message: "Grn not found "
});
}
})

Answer 1

Use a combination of $[] positional-all operator with array filters to update your inner nested document.
var query = {
requirements: {
$elemMatch: {
"grns.grnno": "10431001"
}
}
};
var update = {
$set: {
'requirements.$[].grns.$[inner].invoice_no': "test",
'requirements.$[].grns.$[inner].vehicle_no': "5455",
}
};
var options = {
arrayFilters: [
{ "inner.grnno" : "10431001" }
]
};
db.collection.update(query, update, options);
Update -
NodeJS native MongoDb driver code attached, which is working fine
const { MongoClient } = require('mongodb');
const url = "mongodb://localhost:27017/";
MongoClient.connect(url, function(err, db) {
if (err) {
throw err;
}
const dbo = db.db("test");
(async() => {
const query = {
requirements: {
$elemMatch: {
"grns.grnno": "10431001"
}
}
};
const update = {
$set: {
'requirements.$[].grns.$[inner].invoice_no': "test",
'requirements.$[].grns.$[inner].vehicle_no': "5455",
}
};
const options = {
arrayFilters: [
{ "inner.grnno" : "10431001" }
],
multi: true
};
try {
const updateResult = await dbo.collection("collection").update(query, update, options);
} catch (err) {
console.error(err);
}
db.close();
})();
});