Discussion on: Restrict specific fields updation in Firebase Firestore

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Replies for: Thanks for this @ Kushagra, really helpful! I had a situation where I had to secure the fields of a Firestore map. This is what I got so far, whic...

You could simplify this by using "MapDiff":

function notUpdatingNested(fsmap, field) {
    return !(fsmap in request.resource.data) 
        || (
            (request.resource.data[fsmap] is map)
            && (fsmap in resource.data)
            && !(request.resource.data[fsmap].diff(resource.data[fsmap]).affectedKeys().hasAny([field]))
        )
}