在嵌套集合中将 onCreate 与 Firebase 云函数一起使用

Question

I am looking to create a Firebase Cloud Function that gets called every time a document gets created. Using their tutorial I have the following code in:

exports.sendConfirmationEmail = functions.firestore.document('collection1/{resId}')
    .onCreate((snap, context) => {
      // my method
    });

now this method gets called every time a document gets added to collection1. But I have a database structure that looks like the following:

| businesses

| => business document

| => | reservations

Not sure if that makes any sense but essentially there is a business collection where each business document contains a reservations subcollection. I need to write a function that gets executed every time a document gets added to the reservations collection in each business, but still be able to access the business document somehow. How can I accomplish this? Thanks for any help.

Answer 1

Your function definition will look like this:

exports.yourFunctionName =
functions.firestore.document('businesses/{businessId}/reservations/{reservationId}')
.onCreate((snap, context) => {
    // your code goes here
});

Answer 2

For any one else, looking here is what this would look like when trying to retrieve both the business and the reservation:

exports.getReservationFromBusiness = functions.firestore.document('businesses/{bisId}/reservations/{resId}')
    .onCreate((snap, context) => {
      const businessId = context.params.bisId;
      const reservation = snap.data();
    });

This code is from the documentation and Github page .