Firestore: How to update an existing field

Question

I am trying to update a Firestore document field I have set earlier through REST API.

I have a document (users) which contains all user data. Now I like to be able to update the field 'testfield' - which is part of this user data - through REST API.

I have sent a HTTP POST Request to https://firestore.googleapis.com/v1/projects/[MY_PROJECT_ID]/databases/(default)/documents/users?documentId=-example

with request body

{
    "fields": {
        "testfield": {
            "booleanValue": true
        }
    }
}

All I get by now is an error message telling me that the document already exists, what I know, since I am trying to update this document.

Answer 1

According to the Firestore REST API documentation , you use a PATCH request to update a field.

A POST isn't going to work, since that's used for creating new documents. That explains the error that the document already exists.