Traversing dataSnapshot for Firebase using gson or children

 dataSnapshot.children.forEach {

                    val answer = it.child("cardAnswer").value as String
                    val question = it.child("cardQuestion").value as String
                    val courseId = it.child("courseId").value as String

                    val cardDs = it.value //map
                    val json = Gson().toJson(cardDs)
                    val card = Gson().fromJson<Card>(json, Card::class.java)
//                    card.cardAnswer = answer
//                    card.cardQuestion = question
//                    card.courseId = courseId

                    adapter.add(CardItem(card))
                }




data class Card(var courseId: String, var cardQuestion: String, var cardAnswer: String) {
    constructor() : this("", "", "")
}