Firebase query ordering not working properly

Question

Basically I have played with Firebase for the past week, and I recently stumbled upon the \'queryOrderedByChild()\' that as far as I know - allows you to sort data in fireba

Answer 1

You say that you're ordering by a number, but the value of your id property is stored as a string.

Since you're storing them as a string, they will be returned in lexicographical order.

If you want them to be in numerical order, you should store them as numbers

"-KHVUwXdVPHmrO_O5kil" : {
  "id" : 0,
  "name" : "Jeff"
},

Alternatively, you could store the ids as zero-padded strings:

{
  "names" : {
    "-KHVUwXdVPHmrO_O5kil" : {
      "id" : "0000",
      "name" : "Jeff"
    },
    "-KHVV7lCeac0cZNMi9fq" : {
      "id" : "0003",
      "name" : "Stig"
    },
    "-KHVVCjXgl0XxasVOHF1" : {
      "id" : "0013",
      "name" : "Ali"
    },
    "-KHVVJtyUO-yJZiompJO" : {
      "id" : "0007",
      "name" : "Hannah"
    },
    "-KHVVR8tMSO1Oh7R8tR1" : {
      "id" : "0002",
      "name" : "Amanda"
    }
  }
}

Since the strings are all the same length, they will be sorted in the correct order. But you'll have to decide on the length of the string/maximum id value in the latter solution, so it seems worse.