Cloud Firestore rules - Allowing anybody to update one specific field in a document
问题 I'm working on a PoC (Proof of Concept) application that users can download wallpapers to their device. All of the data is served using Cloud Firestore & Storage. There is NO LOGIN for this application. Anybody can download the application, and immediately download the wallpapers she or he desires. Bearing that in mind... I would like to have a counter that tracks how many times each specific wallpaper was downloaded. While I have it "working" - I am questioning the rules I have set up in