How to get the key from the value in firebase

Question

How do I get the key \"-KLpcURDV68BcbAvlPFy\" when I know the field \"name\" contains \"efg\" in the following structure in Firebase.

clubs
    -KLpcURDV68Bc         


        

Answer 1

Here is how I did it in Kotlin

var ref  = database.child("clubs")
val database_listener = object : ValueEventListener {
        override fun onDataChange(dataSnapshot: DataSnapshot) {
            for (ds in dataSnapshot.children) {
                val key = ds.key
           }
        }
     }
   ref.addValueEventListener(database_listener)