How to get DocumentReferences in array inside a Document - node.js

Question

Very new to await/async pattren in cloud functions. Have a cloud functions that fetches data from a doucment which has an array of DocumentReferences
/* Create new Chilla for a given date */
exports.createNewSalikChilla = functions.https.onRequest(async (req, res) => {
const email=req.body.email;
const date=req.body.date;
console.log('Creating chilla for Salik <' + email + '> on <' + date + '>');
const db = admin.firestore();
const habits = [];
const salikRef = db.collection('saliks').doc(email);
const salik = await salikRef.get();
if (!salik.exists) {
throw new Error("Salik not found for <" + email + ">");
}
const assignedHabits = salik.data()['assigned_habits'];
assignedHabits.forEach(element => {
//LOST on how to get these Document Reference and push to habits = []
});
res.send({status: "Success"});
});
The document in the saliks collection has the following structure on firestore
assigned_habits<array>:
0:
habit<reference>: /habits/first
required<number>: 200
1:
habit<reference>: /habits/second
required<number>: 4
name: "Hani Q"
But have tried everything and can't seem to figure out how to use async/await here to get all the DocumementReferecnce from the array and push to Habit Array and then after all is done i send back res.send({status: "Success"});
Answer
Below worked after implementing the accepted answer
const assignedHabits = salik.data()['assigned_habits'];
const habits_data = (await Promise.all(assignedHabits.map(element => element.habit.get())))
.map(snapshot => snapshot.data());
console.log(habits_data);
res.send({status: habits_data});

Answer 1

Whenever you need to wait for a bunch of asynchronous operations, you'll want to use Promise.all(). In your case that'd look something like:
const assignedHabits = salik.data()['assigned_habits'];
const habits = await Promise.all(assignedHabits.map(element => element.habit.get()));
res.send({status: "Success"});
The above code assumes that habit is a DocumentReference field type.