So in Play 2.0 I had this:
GET /tasks/add controllers.Tasks.addTask(parentId: Option[Long] = None)
GET /tasks/:parentId/add controllers.Tasks.addTask(parentId: Option[Long])
With a controller method like this:
def addTask(parentId: Option[Long]) = Action {
Ok(views.html.addTask(taskForm, parentId))
}
And it was working. As I migrated to 2.1, it seems to complain about these lines with: No URL path binder found for type Option[Long]. Try to implement an implicit PathBindable for this type.
Basically, what I am trying to accomplish is to have route tasks/add
and route tasks/123/add
link to the same method that accepts an Optional[Long]
. Any idea how to do this? Thanks.
Ok, so I got a kind of it's not a bug, it's a feature response on Lighthouse: "We removed Option[Long] support in path bindables since it doesn't make sense to have a optional path parameter. You can implement your own path bindable that supports it if you please." So far I have 2 solutions, passing -1 as parentId, which I do not really like. Or having 2 different methods, which probably makes more sense in this case. Implementing the PathBindable doesn't seem too feasible right now, so I will probably stick with having 2 methods.
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.
I think you have to add a question mark:
controllers.Tasks.addTask(parentId: Option[Long] ?= None)
From this routes-with-optional-parameter the suggestion goes like:
GET / controllers.Application.show(page = "home")
GET /:page controllers.Application.show(page)
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