Descending query when using orderByChild()

Hey there, @pautena and I are developing an Android app with a Firebase backend at Hack The North 2016.

We’ve faced this problem and we think that could be nice to solve with a new feature in future versions:

• When using the Firebase Realtime Database we were trying to get a DatabaseReference like this mFirebaseDatabaseReference.child(User.USER_CHILD).orderByChild("points") to make a ranking, but we faced the problem that Firebase only retrieves the ordered data in ascendent mode.

We think that would be awesome to have the possibility to query orderByChild with some kind of parameter which indicates if you want your data ordered in an ascendent or descendent way.

We post this issue to stay tuned for improvements in this area and hope Firebase become even more cool! 😄

[anrodon]

We’ve found a good solution if you’re using the DatabaseReference to populate a FirebaseRecyclerAdapter, here it goes:

• Inside the FirebaseRecyclerAdapter declaration, override the getItem() function just like we did:

@Override
public User getItem(int position) {
        return super.getItem(getItemCount() - 1 - position);
}

Hope it helps anybody with the same problem 😄

[Niraj-Ranjan]

Hi Suhailakl, could you better explain where this code should be included? I can not make it work. Thank you.

You can add it to onCreate