Why does this Firebase “.indexOn” not work?

Question

So I have data like so:

pushNotifications {
    -K - RwEgd541PIGNOXXUH: {
        message: \"Xiaoyu Hugh Hou bid at $900 on your task: New P...\"
        no         


        

Answer 1

You need to put the .indexOn one level higher than what you did:

 "pushNotifications": {
    ".read": "auth != null",
    ".write": "auth != null",
    ".indexOn": ["notifyId", "timestamp"]
},

For comparison always look at the Firebase documentation on indexes, which uses this JSON example:

"dinosaurs": {
  "lambeosaurus": {
    "height" : 2.1,
    "length" : 12.5,
    "weight": 5000
  },
  "stegosaurus": {
    "height" : 4,
    "length" : 9,
    "weight" : 2500
  }
}

With this indexing rule:

{
  "rules": {
    "dinosaurs": {
      ".indexOn": ["height", "length"]
    }
  }
}