Mongoose NodeJS Express - Edit a specific sub document field - node.js

Question

I have the following schemas designed in my Node server
SCHEMAS
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const dataSchema = new Schema({
time: Date,
value: String
});
const nodeSchema = new Schema({
name: String,
description: String,
number: Number,
status: String,
lastSeen: Date,
data: [dataSchema]
});
const siteSchema = new Schema({
code: String,
name: String,
description: String,
totalNodes: Number,
nodes: [nodeSchema]
});
const Site = mongoose.model('site',siteSchema);
module.exports = Site;
They basically look like this. You can see there are two nodes with some demo data.
EXAMPLE
{
"_id": "5fa169473a394829bc485069",
"code": "xfx3090",
"name": "Name of this site",
"description": "Some description",
"totalNodes": 2,
"__v": 0,
"nodes": [
{
"_id": "5fa1af361e085b516066d7e2",
"name": "device name",
"description": "device description",
"number": 1,
"status": "Offline",
"lastSeen": "2020-11-03T19:27:50.062Z",
"data": [
{
"Date": "2019-01-01T00:00:00.000Z",
"value": "12"
},
{
"Date": "2019-01-01T00:00:00.000Z",
"Value": "146"
}
]
},
{
"_id": "5fa1b10f4f24051520f85a58",
"name": "device name",
"description": "device description",
"number": 2,
"status": "Offline",
"lastSeen": "2020-11-03T19:35:43.409Z",
"data": [
{
"Date": "2019-01-01T00:00:00.000Z",
"Value": "555"
}
]
}
]
}
]
My question is how can I update a specific field of a node, in particular how I can update the last seen or the status. It is important to mention that the client making the request will only have access the the site code and the node number. The Object Id's of sites and nodes will not be known.
So far this is what I have, but it only creates one new Object Id for some reason.
Any advice will be appreciated
updateNode: async (req,res,next) => {
const {siteCode} = req.params;
const { nodeNumber } = req.params;
const status = req.body.status;
const nodeStatus = await Site.findOneAndUpdate({'code': siteCode, 'nodes.number':nodeNumber}, { '$set': {'nodes.$.status': {'status':status}}});
res.status(200).json({message: 'success'});
}

Answer 1

You'll need to do it this way.
I have predefined the ._ids.
You can do this dynamically if you want. If you are using express you could just use queries. Example req.query.documentID. The URL to access it will be localhost:p/?documentID=5fa169473a394829bc485069&nodeID=5fa1af361e085b516066d7e2
p in localhost is for port
await Site
.findOne({
"_id": "5fa169473a394829bc485069",
"nodes._id": "5fa1af361e085b516066d7e2"
})
.update({ "lastSeen": Date })
.then(doc => res.json(doc))
.catch(e => console.log(e))
Basically finding a doc with id of 5fa169473a394829bc485069
Then a node with _id of 5fa1af361e085b516066d7e2
And then update() method and { "lastSeen": Date } parameter to Date.
That's it!
EDIT
You'll have to create a VALID MongoDB object by doing this
app.get("/new", async (req, res) => {
let Site = new model({
code: "String",
name: "String",
description: "String",
totalNodes: 2,
nodes: [
{
_id: new mongoose.Types.ObjectId,
name: "String",
description: "String",
number: 1,
status: "offline",
lastSeen: Date.now(),
data: [{ "someData": "someData" }]
},
{
_id: new mongoose.Types.ObjectId,
name: "String",
description: "String",
number: 2,
status: "offline",
lastSeen: Date.now(),
data: [{ "someData": "someData" }]
}
]
});
await Site
.save()
.then(doc => {
console.log(doc);
res.json(doc);
})
.catch(e => console.error(e));
});
Everything is loaded with dummy data. Then you update the data like this.
app.get("/", async (req, res) => {
await model
.findOne({ "code": "String" })
.update({
"nodes.0.status": "online"
})
.then(doc => {
console.log(doc);
res.json(doc);
})
.catch(e => console.error(e));
})
Basically you access the object at the index position 0 ( that means the first post ) like this nodes.0 and then the status of that object will be respectively nodes.0.status. Then you just save the object and that's it!