How to post and populate bill - node.js

Question

I've got a relational json called "client" inside Bill's model. This is my code:
const mongoose = require("mongoose");
const { Schema } = mongoose;
const billSchema = new Schema({
number: Number,
date: { type: Date, default: Date.now() },
type: String,
local: String,
client: { type: mongoose.Schema.Types.ObjectId, ref: "clients", required: true },
detail: [
{
quantity: Number,
product: { code: Number, name: String, price: Number },
undertotal: Number
}
],
total: Number
});
mongoose.model("bills", billSchema);
this is my post route:
app.post("/api/bills", async (req, res) => {
const { number, type, local, client, detail, total } = req.body;
await Client.findById(req.body.client._id).then(client => {
if (!client) {
return res.status(404).json({
message: "client not found"
});
}
});
const bill = new Bill({
number,
date: new Date(),
type,
local,
client,
detail,
total
});
try {
let newBill = await bill.save();
res.status(201).send(newBill);
} catch (err) {
if (err.name === "MongoError") {
res.status(409).send(err.message);
}
res.status(500).send(err);
}
});
//my get route
app.get("/api/bills", function(req, res) {
Bill.find({}, function(err, bills) {
Client.populate(bills, { path: "clients" }, function(err, bills) {
res.status(200).send(bills);
});
});
});
I want something like this:
{
"number": 302,
"type": "c",
"local": "porstmouth",
"client": {
"address": {
"street": "victoria street",
"number": 1001,
"floor": "2",
"flat": 4
},
"_id": "5dab929613fb682b48e4ca6b",
"name": "luke skywalker",
"mail": "l.skywalker#yahoo.com",
"cuil": "39193219",
"phone": 128391,
"__v": 0
},
"detail": [
{
"quantity": 500,
"product": {
"code": 300,
"name": "P2",
"price": 800
},
"undertotal": 5000
}
],
"total": 11000
}
But I see this result:
{
"date": "2019-10-20T12:27:17.162Z",
"_id": "5dac52a577e09b4acc45718d",
"number": 302,
"type": "c",
"local": "porstmouth ",
"client": "5dab929613fb682b48e4ca6b",
"detail": [
{
"_id": "5dac52a577e09b4acc45718e",
"quantity": 500,
"product": {
"code": 300,
"name": "P2",
"price": 800
},
"undertotal": 5000
}
],
"total": 11000,
"__v": 0
}
I don't want to see id client only. I want to see all content from client inside bill.
I tried to do with populate method, but I haven't results.
So, Which is form to post and populate a nested json relational object in this case?

Answer 1

While posting only clientId is enough.
So your post route can be like this (you both used await and then, which is incorrect, so I refactored it to use only await)
app.post('/api/bills', async (req, res) => {
const { number, type, local, client, detail, total } = req.body;
let existingClient = await Client.findById(req.body.client._id)
if (!existingClient) {
return res.status(404).json({
message: "client not found"
});
}
const bill = new Bill({
number,
date: new Date(),
type,
local,
client: req.body.client._id
detail,
total
})
try {
let newBill = await bill.save();
res.status(201).send(newBill);
} catch (err) {
if (err.name === 'MongoError') {
res.status(409).send(err.message);
}
res.status(500).send(err);
}
});
And in the get route to retrieve all the client info you need to populate it like this:
app.get('/api/bills', async (req, res) => {
try {
const bills = await Bill.find({}).populate("clients");
res.status(200).send(bills);
} catch (err) {
console.log(err);
res.status(500).send(err);
}
}
)