database.rules.json.example

{
  "rules": {
    "rooms": {
      ".read": "get this rules from your firebase project",
      ".write": "get this rules from your firebase project",
      "$roomId": {
        ".read": "get this rules from your firebase project",
        ".write": "get this rules from your firebase project",
        "questions": {
          ".read": "get this rules from your firebase project",
          ".write": "get this rules from your firebase project",
            "$questionId":{
              ".read": "get this rules from your firebase project",
                  ".write": "get this rules from your firebase project",
              "likes": {
                ".read": "get this rules from your firebase project",
                ".write": "get this rules from your firebase project"
              }
            }
        }
      }
    }
  }
}