Using .indexOn with nested keys in Firebase

Question

I have a a bunch of keys that i want to index using .indexOn

Suppose my data looks like the following. I want to be able to use .orderByChild("height").

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

How wound I specify the rule for indexing height which is a child of stats? Do I have to restructure or flatten my data?

Answer 1

You can query and index arbitrarily deep now.

{
  "rules": {
    "$dinosaur": {
      ".indexOn": ["stats/height"]
    }   
  }
}

and query on nested values:

.orderByChild('stats/height')