Mongoose update the ENTIRE object inside a document with a nested array - mongodb

Question

There are so many questions and answers regarding this subject but why not make it simple.
Branch schema
const Branch = new Schema({
name: { Type: String },
address: {
houseNumber: { Type: String },
street: { Type: String },
city: { Type: String }
}
})
Client schema
const Client = new Schema({
...,
...,
branches: [ branch ] // BRANCH SCHEMA IS SUB DOCUMENTED HERE
})
I know how to $push and $pull branch from branches array.
What I need is to UPDATE the ENTIRE branch object inside branches array, NOT JUST ONE FIELD like I found in so many answers and YES I would like to have back the modified document.
let clientId = req.body.clientId;
let branch = req.body.branch;
Client
.findOneAndUpdate(
{
"_id": clientId,
"branches._id": branch._id
},
{
OPTION 1 // MODIFIED ONLY THE FIRST ITEM (object) IN THE ARRAY
"$set:" { "branches.$": { branch } }
OPTION 2 // MODIFIED EVERY ITEM (object) IN THE ARRAY
"$set:" { "branches.$[]": { branch } }
STILL NO GOOD... HOW TO SOLVE THIS ??
}
)
.then(client => {
WHAT SHOULD I DO HERE IN ORDER TO UPDATE AN ENTIRE BRANCH ??
})
.catch(e => console.log(`error Client.findOne() ${e}`))

Answer 1

You can use mongoose arrayFilters to achieve what you want:
Client
.findOneAndUpdate(
{
"_id": clientId,
"branches._id": branch._id
},
{
"$set:" { "branches.$[elem]": { branch } }
},
{
arrayFilters: [ { 'elem._id': branch._id } ]
}
)
.then(client => {
})
.catch(e => console.log('error Client.findOne() + e))

Answer 2

Okay, here is how I did it..
let clientId = req.body.clientId;
let branch = req.body.branch;
Client
.findOne({ _id: clientId })
.then(client => {
// finding the index
const elementIndex = client.branches.findIndex(element => element._id.toString() === branch._id.toString());
// creating new array and assigning the branches array to it using spread syntax
let newBranches = [ ...client.branches ];
// adding the branch I need to update to newBranches array (at the same index)
newBranches[elementIndex] = branch;
// replacing branches array with the new one, again using spread syntax
client.branches = [ ...newBranches ];
// saving
client.save();
})
.catch(e => console.log(`error Client.findOne() ${e}`))
enjoy!