Scala create group of elements

Question

I want to create a group of elements in a message as in below image

Updated:

 case class Element(key:String;value:String)


        

Answer 1

If I understand the domain correctly, something like this should work:

case class Message(entries: List[Entry])

case class Entry(name: String, value: Value)
trait Value
object Value {
  case class Single (v: String) extends Value
  case class Group (entries: List[List[Entry]]) extends Value
}

Message(
  Entry("Key 1", Value.Single("Value 1")),
  Entry("Key 2", Value.Group(
    List(
      List(
        Entry("Key 3", Value.Single("Value 3")),
        Entry("Key 4", Value.Single("Value 4"))
      ),
      List(
        Entry("Key 3", Value.Single("Value 5")),
        Entry("Key 4", Value.Single("Value 6"))
      )
    )
  ))
)

Of course some helper functions could be created to make a nicer DSL for it.