[Slick 2.0] map to Option[String] in a case class cause compiling error

[Zhao Wang]

Hi I have the following simple code generating a compile error seems to be conflict with what the document says:

case class Task(id: Option[Int], title: String, note: Option[String])

class Tasks(tag: Tag) extends Table[Task](tag, "task") {

  def id   = column[Int]("title", O.PrimaryKey, O.AutoInc)

  def title  = column[String]("title")

  def street = column[Option[String]]("note")

  def * = (id.?, title, street.?) <> (Task.tupled, Task.unapply)

}

It will generate a compile error:

[error] /Users/admin/workspace/play/demo/app/models/Test.scala:36: could not find implicit value for evidence parameter of type scala.slick.ast.BaseTypedType[Option[String]]

[error]   def * = (id.?, title, street.?) <> (Task.tupled, Task.unapply)

[error]                         ^

[error] one error found

[error] (compile:compile) Compilation failed

In the Slick 2.0 document, it says "Nullable columns are represented by Option[T] where T is one of the supported primitive types." at http://slick.typesafe.com/doc/2.0.0/schemas.html . So I suppose this should work.

Do I miss something here? Thanks. 

[Christopher Vogt]

> def * = (id.?, title, street.?) <> (Task.tupled, Task.unapply)

User street instead of street.?
Street is already an Option. no need for .? Does that help?

Chris

[Zhao Wang]

I see. It does solve the problem. I misunderstood how .? works. By looking at the source code, I now see how it works.

Thanks for the help.  :)