Firestore - batch.add is not a function

Question

The documentation for Firestore batch writes lists only set(), update() and delete() as permitted operations.

Is there no way to add an add() operation to the batch? I need a document to be created with an auto-generated id.

Answer 1

You can do this in two steps:

// Create a ref with auto-generated ID var newCityRef = db.collection('cities').doc();  // ...  // Add it in the batch batch.set(newCityRef, { name: 'New York City' }); 

The .doc() method does not write anything to the network or disk, it just makes a reference with an auto-generated ID you can use later.

Answer 2

In my case, using AngularFire2, I had to use the batch.set() method, passing as first parameter the document reference with an ID previously created, and the reference attribute:

import { AngularFirestore } from '@angular/fire/firestore'; ... private afs: AngularFirestore ... batch.set(     this.afs.collection('estados').doc(this.afs.createId()).ref,     er.getData()   );