CODEWITHSUNDEEP
androidsortingfirebasefirebase-realtime-database
Lion789
Lion789

Reputation: 4482

How to sort by children key value in firebase?

I am trying to sort projects based on the dateAdded:

The tree looks like this:

projects: {
    "someprojectId": {
       dateAdded: Firebase.TimeStamp
    },

    "someProjectid2":{
      dateAdded: Firebase.Timestamp
   }

}

I am calling it like so in android:

mDatabase.child("projects").orderByChild("dateAdded").addValueEventListener(new ValueEventListener() {

However, it is not sorting it correctly, or at all for that matter of fact?

Upvotes: 1

Views: 9371

Answers (1)

Frank van Puffelen
Frank van Puffelen

Reputation: 598785

It would help to see how you actually handle the data in onDataChange. But my guess is that you're failing to loop over the children:

mDatabase
  .child("projects")
  .orderByChild("dateAdded")
  .addValueEventListener(new ValueEventListener() {
    public void onDataChange(DataSnapshot snapshot) {
      for (DataSnapshot child: snapshot.getChildren()) {
        System.out.println(child.getKey());
      }
    }
    ...

Upvotes: 5

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