Firebase sort by points depending on date

Question

I am trying to add a monthly scoreboard but it seems to be a little bit difficult to me. I don\'t know how to just take a specific value to some list or array. Like Date, on

Answer 1

If you want to query date ranges, you should store them in a format that allows querying ranges. For dates that would be either a timestamp or a string that is lexicographically sortable.

You currently store dates as a dd.MM.yyyy string, which is not lexicographically sortable. I recommend switching to yyyy-MM-dd, so 2019-01-09. That way if you want to get all posts for January, you can do a range query:

ref.orderByChild("date").startAt("2017-01-01").endAt("2017-01-31")

If you already know that you want monthly leaderboard, I'd recommend changing your database structure to reflect that. So: store the scores by the month that they're in:

2017-01
  -K34761761238712
    name: "GGGG"
    score: 3
  -K4875731941298a
    name: "AAA"
    score: 1

That way you can get the high scores for January in order with:

ref.child("2017-01").orderByChild("score").limitToLast(10)