Scala将Seq [Object]转换为Map [String，Map [String，String]]

Question

I am new to Scala so I am a bit fighting with maps.

I have

val items = Seq[MyModel]

where MyModel (came from Java) contains getLang, getName and getMessage methods.

Now I need to fill up the

var loadedMessagesMap: Map[String, Map[String, String]] = ListMap.empty

to contain values grouped by lang in structure: lang -> (name -> message). Name property is unique. Thank you.

Answer 1

Maybe this will help you:

val result: Map[String, Map[String, Seq[String]]] = items.groupBy(_.getLang).map {
  case(lang, models) =>
    lang -> models.groupBy(_.getName).mapValues(_.map(_.getMessage))
}

It returns a Seq[String] because there might be several messages for the same language and name. Not sure how you want to handle that case.

Answer 2

This should do the trick:

val models: Seq[MyModel] = ???
val mapped = models.map { model =>
  model.getLang -> Map(model.getName -> model.getMessage)
}.toMap

I hope this helps you.