Update document in MongoDB via NodeJS - node.js

Question

So my knowledge of NodeJS and MongoDD are non-existent (just need to do a small code update for a friend) and I'm stuck.
Need to update a single document inside a collection via a unique id but can't seem to do it.
Here's the Model (I've trimmed it down and cut out all unnecessary data). I'm trying to update the field notes inside a transaction.
In short each entry in the given (an Agent) table will have a collection of multiple Transactions & Documents. I need to update a specific Transaction with the unique _id that is auto generated.
import { Schema, model } from 'mongoose';
interface Transaction {
first_name: string;
last_name: string;
type: string;
notes: string;
}
interface Agent {
org_id: number;
transactions: Array<Transaction>;
documents: Array<string>;
}
const transactionSchema = new Schema<Transaction>({
first_name: { type: String },
last_name: { type: String },
type: { type: String },
notes: String,
});
const transactionsSchema = new Schema<Agent>({
org_id: { type: Number },
transactions: [transactionSchema],
documents: [documentTypesSchema],
});
const AgentTransaction = model<Agent>(
'agent_transaction_table',
transactionsSchema
);
export default AgentTransaction;
Here's what I tried but didn't work (obviously), again I've trimmed out all unnecessary data. Just to clarify, the endpoint itself works, but the DB update does not.
import AgentTransaction from '../models/transaction'; // the above model
transaction.put('/notes', async (req, res) => {
const { org_id, transaction_id, notes } = req.body;
try {
const notesResult = await AgentTransaction.updateOne({
'transactions._id': transaction_id,
}, {
$set: {
'notes': notes
},
});
res
.status(200)
.json({ message: 'Updated', success: true, notesResult });
} catch (error) {
res.status(400).send(error);
}
});

Answer 1

So I figured it out. Maybe it'll help someone else as well.
const notesResult = await AgentTransaction.updateOne({
'transactions._id': { $in: [trunc2] },
}, {
$set: {
'transactions.$.notes': notes
},
});
The main issue was that the payload object needed to target the collection folder + the wildcard + the field, not just only the field.