Updating a string field in all documents found in a collection in Firestore

Question

Basically, I would like to know if it is possible to update all of the documents found in a collection in Firestore. I am able to get all the documents in a list like so:

<

Answer 1

There is no single operation that will update multiple documents based on som search criteria. You will have to iterate the query results as you're doing now, then individually update each of the documents. You could possibly also use a transaction or batch write to perform the updates atomically, but that will not let you prevent iterating all the documents in the initial query result.