CODEWITHSUNDEEP
scaladictionary
glarkou
glarkou

Reputation: 7101

Type of a result after map

I have the followeing classes:

case class RolepermissionRow(roleid: Int, permissionid: Int)

and 

case class RolePermissionJSON(
                           var id: Option[Long],
                           var num: Option[Int],
                           var name: Option[String],
                           var perms: Map[String, Boolean])

I create a map:

var s = Map("1" -> true)

I create a RolePermissionJSON:

val f = RolePermissionJSON(Some(0), Some(0), Some('test'), s)

And I would like to convert the perms Map to RolepermissionRow using the following code:

scala> f.perms.map { case (key, value) => if (value) RolepermissionRow(key.toInt, 1) }.toSeq
res7: Seq[Any] = List(RolepermissionRow(1,1))

The result is Seq[Any] but I would like to have Seq[RolepermissionRow]

Upvotes: 1

Views: 57

Answers (2)

chengpohi
chengpohi

Reputation: 14227

f.perms.filter(_._2).map{case (key, value) => RolepermissionRow(key.toInt, 1) }.toSeq

I think you should use filter firstly to filter the map avoid empty Map.

Upvotes: 1

vvg
vvg

Reputation: 6385

Simple changes required:

val z = f.perms.map { case (key, value) if (value) => RolepermissionRow(key.toInt, 1) }.toSeq

Now description:

In your code resulted Seq contains of RolepermissionRows if value is true and Units otherwise. You should filter out "empty" elements of map that gives you Unit.

UPD: @nafg advice to use collect to prevent match error in runtime.

Upvotes: 3

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