how to fetch subcollection's data in firestore? - node.js

Question

I have built a webapp using node express to backend and for frontend I used Reactjs .
In firestore database has a "users" collection in there have many documents for every users. For each document have fields and have subcollections.
1st view
2nd view (in a subcollection view)
this is the sample database like my real database structure .I want fetch all users(inside the users table documents) andalso with subcollections fields.
For every users have same subcollections.(Like as this image user have 4 subcollections andaslo another user also have that same subcollections.)
For this I write the code like this.
model class
class Users {
constructor(id,name,email,provider,firstWord,leda,age,birthday,district,gender,familyChildren,fatherEducation,monthlyIncome,motherEducation,whichChild,awaSE,awaUN,kathakaraaSE,kathakaraaSE,kathakaraaUN) {
this.id = id;
this.name = name;
this.email = email;
this.provider = provider;
this.email = firstWord;
this.email = leda;
this.age = age;
this.birthday = birthday;
this.district = district;
this.gender = gender;
this.familyChildren = familyChildren;
this.fatherEducation = fatherEducation;
this.monthlyIncome = monthlyIncome;
this.motherEducation = motherEducation;
this.whichChild = whichChild;
this.awaSE = awaSE;
this.awaUN = awaUN;
this.kathakaraaSE = kathakaraaSE;
this.kathakaraaUN = kathakaraaUN;
}
}
module.exports = Users;
controller
'use strict';
const firebase = require('../db');
const Users = require('../models/users');
const firestore = firebase.firestore();
const getAllUsers = async (req, res, next) => {
try {
const users = await firestore.collection('users');
const data = await users.get();
const userArray = [];
if(data.empty) {
res.status(404).send('No user found');
}else {
data.forEach(doc => {
const users = new Users(
doc.id,
doc.data().name,
doc.data().email,
doc.data().provider,
doc.data().firstWord,
doc.data().leda,
doc.data().age,
doc.data().birthday,
doc.data().district,
doc.data().gender,
doc.data().familyChildren,
doc.data().fatherEducation,
doc.data().monthlyIncome,
doc.data().motherEducation,
doc.data().whichChild,
doc.data().awaSE,
doc.data().awaUN,
doc.data().kathakaraaSE,
doc.data().kathakaraaUN,
);
userArray.push(users);
});
res.send(userArray);
}
} catch (error) {
res.status(400).send(error.message);
}
}
module.exports = {
getAllUsers,
}
router class
const router = require("express").Router();
const { getAllUsers } = require('../controllers/userscontroller.js')
router.get('/AllUsers', getAllUsers);
module.exports = router;
model class image
1.users collection fields
2.childGrow collection fields
3.childPrivateDetails collection fields
4.familyDetails collection fields
5.wenath collection fields
but out put is
in there not display other collections fields.
How I do that using node express?

Answer 1

You can do something like this:
const getAllUsers = async (req, res, next) => {
try {
const users = await getFirestore().collection('users');
const data = await users.get();
const userArray = [];
if (data.empty) {
res.status(404).send('No user found');
} else {
for (let doc of data.docs) {
let firstSubCollectionData = await getFirestore().collection('users').doc(doc.id).collection('firstSubCollection').get();
let secondSubCollectionData = await getFirestore().collection('users').doc(doc.id).collection('secondSubCollectionData').get();
let thirdSubCollectionData = await getFirestore().collection('users').doc(doc.id).collection('thirdSubCollectionData').get();
let forthSubCollectionData = await getFirestore().collection('users').doc(doc.id).collection('forthSubCollectionData').get();
// construct your object here
// add it to list
}
res.send(userArray);
}
} catch (error) {
res.status(400).send(error.message);
}
}
BUT
sub-collections can be potentially a list of values. If not I think you have to redesign your data model.