complicated demo for https://medium.com/@tonny/recyclerview-2020-when-recyclerview-meets-data-binding-616ca5c2147d

RecylerAdapterExample.kt

data class Comment(
  ...
) : RecyclerItem {
 ...
}

data class ComplexModel(
  val model: SomeModel
  ...
) : RecyclerItem {
  override val layoutId: Int
    get() = R.layout.list_itme

  override val variableId: Int
    get() = BR.data

  override val dataToBind: Any
    get() = model.aMappingOfModel()

  override val id: Int
    get() = model.id
}

//PostFragment
private val adapter by lazy {
  RecyclerAdapter(RecyclerItem.diffCallback<Post>())
}

//AFragment
private val adapter by lazy {
  RecyclerAdapter(RecyclerItem.diffCallback<ComplexModel>())
}