Routes with optional parameter - Play 2.1 Scala

Question

So in Play 2.0 I had this:

GET     /tasks/add              controllers.Tasks.addTask(parentId: Option[Long] = None)
GET     /tasks/:parentId/add    controlle         


        

Answer 1

Play 2.0 supported Option in path parameters, Play 2.1 no longer supports this, they removed the PathBindable for Option.

One possible solution would be:

package extensions
import play.api.mvc._
object Binders {
  implicit def OptionBindable[T : PathBindable] = new PathBindable[Option[T]] {
    def bind(key: String, value: String): Either[String, Option[T]] =
      implicitly[PathBindable[T]].
        bind(key, value).
        fold(
          left => Left(left),
          right => Right(Some(right))
        )

    def unbind(key: String, value: Option[T]): String = value map (_.toString) getOrElse ""
  }
}

And add this to Build.scala using routesImport += "extensions.Binders._". Run play clean ~run and it should work. Reloading the Binders on the fly only sometimes works.