Validate a Firebase Key is an integer

Question

Here is the database schema:

Here are the rules:

\"notifications\": {
   \"$year\": {
      \".read\": \"false\",
      \".write\": \"!data.         


        

Answer 1

To validate that a key is a number:

{
  "$key": {
     ".validate": "$key.matches(/^[0-9]+$/)"
  }
}

But please read about array-like behaviors in Firebase. Hint: probably use a prefix like "y2015", "m12", etc. to avoid some unexpected results with using numbers.

Answer 2

If using push IDs works for you, here's a security rule structure you could use.

{
    "notifications": {
        "$notification_id": {
            ".write": "!data.exists()",
            ".read": "false",
            ".validate": "newData.hasChildren(['time', 'state', 'message'])",
            "time": {
                ".validate": "newData.val().matches(/YOUR REGEX/)"
            },
            "state": {
                ".validate": ""
            },
            "message": {
                ".validate": ""
            }
        }
    }
}

Obviously you'll need to fill in the blanks. The main thing here is that you can use a regex to match the time field.

The actual data would look like:

{
    "notifications": {
        "-K-z5koYf8mYZu5OfSGR": {
            "time": "2015-10-06-17-30",
            "state": 1,
            "message": "foo"
        },
        "-K-z5koYf8mYZwgwsfGx": {
            "time": "2015-10-06-17-30",
            "state": 1,
            "message": "bar"
        }
    }
}