How to delete from firebase realtime database?

Question

I am using Firebase realtime database in Android app, and have data like this:

How can i delete the record \"Apple\" (marked in picture)?

A

Answer 1

You can use this code :

onDeletePost(id:string){
return this.http.delete(`https://my-angular8-prjt.firebaseio.com/posts/${id}.json`).subscribe();
}

Answer 2

If you are using firebase-admin you can simply try this out as

admin.ref(`/users/${userid}`).remove()

and that works for me.

And also do remember to use async and await syntax.

Answer 3

this solved my problem

 mPostReference = FirebaseDatabase.getInstance().getReference()
                        .child("quotes").child(mPostKey);
                mPostReference.removeValue();

Answer 4

Depending on how and why you are deleting the data you can use these:

// Could store the push key or get it after push
String newPostKey = yourDatabase.child('firebase-test').push({
    something:something
}).key();

// Depends how you get to here
howYouGotHereId.parent().setValue(null);

Firebase Save Data 3.0

Answer 5

If you don't know the key of the items to remove, you will first need to query the database to determine those keys:

DatabaseReference ref = FirebaseDatabase.getInstance().getReference();
Query applesQuery = ref.child("firebase-test").orderByChild("title").equalTo("Apple");

applesQuery.addListenerForSingleValueEvent(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        for (DataSnapshot appleSnapshot: dataSnapshot.getChildren()) {
            appleSnapshot.getRef().removeValue();
        }
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {
        Log.e(TAG, "onCancelled", databaseError.toException());
    }
});