Firebase Functions create multiple documents in one function

Question

I would like to create few documents when new user is created. I understand I can create a separate function for every document, but I would like to put all of them in one function.

Example code for one document (functions/index.js):

const functions = require("firebase-functions");
const admin = require("firebase-admin");
admin.initializeApp();

exports.createWHS = functions.auth.user().onCreate((user) => {
  const docData = {
    name: "myWHS",
    description: "My Awesome Warehouse",
    created: admin.firestore.FieldValue.serverTimestamp(),
    image: "",
    color: "#008080",
  };

  return admin.firestore().collection("users").doc(user.uid)
      .collection("warehouses").doc("myWHS").set(docData);
});

Are there batch writes as well? Thank you

Answer 1

If you want to create multiple documents, you can use Promise.all to wait for all of those to be finished before finishing the function. Something like this:

return Promise.all([
  admin.firestore().collection("users").doc(user.uid)
                   .collection("warehouses").doc("myWHS").set(docData),
  admin.firestore().collection("othercolection").add(docData)
]);