NestingMultipleChoiceV3.scala

trait NestingMultipleChoice[C <: Messages[C]] extends WidgetGroup {
  
  def nestedWidgets: Map[String, Widget]
  
  def nestingMultipleChoiceWidget: MultipleChoice[C]
  
  override lazy val widgets: Seq[Widget] = nestingMultpleChoiceWidget +: nestedWidgets.values.toSeq
  
  def templateChoices(form: Form, errors: ValidationErrors, requestInfo: RequestInfo)(...): Future[List[Map[String, Any]]] = {
    nestingMultipleChoiceWidget.choicesForTemplate.map(...
      // Iterate through the choices already coverted to template params
      // For each choice, find the associated nestedWidget by its key
      // If there is an associated widget, add the result of calling nestedWidget.render(form, errors, requestInfo) to the template params
      ...
    )
  }
  
  override def render(form: Form, errors: ValidationErrors, requestInfo: RequestInfo)(...): Future[String] =
    nestingMultipleChoiceWidget.render(form, errors, requestInfo)
}