Android Firestore RecyclerView With FirestoreUI FirestoreRecyclerAdapter (Kotlin)

dependencies {
    // https://mvnrepository.com/artifact/com.firebaseui/firebase-ui-firestore
    implementation 'com.firebaseui:firebase-ui-firestore:4.3.1'
}

val query = ...val builder = FirestoreRecyclerOptions.Builder<Quote>()    .setQuery(query, object : SnapshotParser<Quote> {        override fun parseSnapshot(snapshot: DocumentSnapshot): Quote {            return snapshot.toObject(Quote::class.java)!!.also {                it.id = snapshot.id            }        }    })    .setLifecycleOwner(this)val adapter = FirestoreQuoteAdapter(options)recyclerView.adapter = adapter

class Quote(    @get:Exclude override var id : String? = null,    @JvmField @PropertyName(CONTENT) var content: String? = "",    @JvmField @PropertyName(SOURCE) var source: String? = null) {    companion object {        const val COLLECTION_NAME = "quote"        const val CONTENT = "content"        const val SOURCE = "source"    }}

class FirestoreQuoteAdapter(options: FirestoreRecyclerOptions<Quote>) : FirestoreRecyclerAdapter<Quote, FirestoreQuoteAdapter.ViewHolder>(options) {    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {        val view = LayoutInflater.from(parent.context)            .inflate(R.layout.quotelist_item, parent, false)        return ViewHolder(view)    }    override fun onBindViewHolder(holder: ViewHolder, position: Int, item: Quote) {        // val id = snapshots.getSnapshot(position).id        holder.apply {            contentTextView.text = item.content            sourceTextView.text = item.source        }    }    inner class ViewHolder(override val containerView: View) : RecyclerView.ViewHolder(containerView), LayoutContainer}