Update a field in an object in Firestore?

Question

This is the example provided in the documentation to update a field within a nested object in firebase.

var frankDocRef = db.collection(\"users\").doc(\"frank\"         


        

Answer 1

To add an entry to a set (a Javascript Object), use DocumentReference.update:

db.collection("users").doc("frank").update({
  "favorites.firebase": "Help")}
})

will result in

favorites: { food: "Pizza", color: "Blue", subject: "recess", firebase: "Help" }