Add new field or change the structure on all Firestore documents

Question

Consider a collection of users. Each document in the collection has name and email as fields.

{
  \"users\": {
    \"uid1\         


        

Answer 1

Just wanted to share because I read that you were hoping for a Firestore based solution.

This worked for me. forEach will query each document in the collection and you can manipulate as you like.

    db.collection("collectionName").get().then(function(querySnapshot) {
        querySnapshot.forEach(async function(doc) {
            await db.collection("collectionName").doc(doc.id).set({newField: value}, {merge: true});
            // doc.data() is never undefined for query doc snapshots
            console.log(doc.id, " => ", doc.data());
        });
    });