In Scala how do you call toMap on a List of a case class?

Question

I would like to be able to call toMap on a List of a case class:

case class Properties(name: String, value: String)

val lst = List(Properties("name1", "val1"))
lst.toMap

This doesn't work because there is no implicit evidence Properties <:< (T,U) so I map the list to a List[(String,String)] then call toMap. Is there anyway of doing this without the map?

Answer 1

In general you're going to need a conversion from your case class to a Tuple2.

If your case class happens to have 2 fields and you want to key on the first field, there's an already available conversion: the companion object's unapply method:

case class Properties(name: String, value: String)

val lst = List(Properties("name1", "val1"))
lst.view.flatMap(Properties.unapply).toMap