Adding and “.indexOn”: “.value” into Firebase Rules

Question

I\'m studying AngularJS and Firebase and I\'m playing with a simple ChatApp, just to understand the code.

My Firebase DB structure is like this:

\"chat\"         


        

Answer 1

I am aware that this may be a bit too late but here is something that may help you. I was looking for the same information as you, and in my case, it helped me.

$usersId matches any child key. So you have to do something like this.

{
"rules": {
      "chat": {
          "rooms": {
              "users": {
                  "$usersId": {
                    ".indexOn": ".value"
                }
            }
        }
    }
}

My case:

Using an unspecified index. Consider adding ".indexOn": "date" at messages/-L2bPVX4_fL41H7lhexc to your security and Firebase Database rules for better performance:

L2bPVX4_fL41H7lhexc == child in my NoSQL database structure

solution:

"messages": {
  "$messagesId": {
    ".indexOn": "date"
  }
}