Search last firebase record and incrementing in new record

Question

I need to fetch the last code in an array of objects in the firebase. Then increment +1 on that last code and then save the list with the objects. For now I created a generic DAO:

//Dao generico

'use strict';

findMaxCode: function(table, callback){
    var refFirebase = this.getInstanceFirebase(table);
    /* Aqui busca ultimo registro na tabela */
    refFirebase.orderByChild("code").on('child_added', function(snapshot) {
        callback(snapshot);
    });
},
saveOrUpdate: function(table, object){
    var refFirebase = this.getInstanceFirebase(table);
    var isSave = (object.code == 0);

    /* Aqui verificar se é para salvar/atualizar */
    if(isSave){
        this.findMaxCode(table, function(last){
            object.code = last.val().code + 1;
            /* Aqui atualize a lista de array */
            refFirebase.push(object);
        })
    }else
        refFirebase.push(object);
},

What happens after including the new record in the array. From what I understand, it is running again the logic that queries the last record and then ends up turning a loop.

That would be the way?

Answer 1

Change:

   refFirebase.orderByChild("code").on('child_added', function(snapshot) {
     callback(snapshot);
   });

For:

 refFirebase.orderByChild("code").on('child_added', function(snapshot) {
     refFirebase.off();
     callback(snapshot);
 });

So you stop listening before you change the record.

One thing to look at is whether Once() would be better, since it reads the die only once.