Scalaquery select firstOption

Task.scala

package models

import play.api.db._
import play.api.Play.current
import org.scalaquery.ql._
import extended.{ExtendedTable => Table}
import org.scalaquery.ql.TypeMapper._
import org.scalaquery.session._
import org.scalaquery.ql.extended.MySQLDriver.Implicit._

case class Task(id: Long, label: String)

object Tasks extends Table[Task]("Task") {

  lazy val database = Database.forDataSource(DB.getDataSource())

  def id = column[Long]("id", O AutoInc, O PrimaryKey, O NotNull)

  def label = column[String]("label", O NotNull)

  def * = id ~ label <>(Task, Task.unapply _)

  // 一件取得
  def find(id: Long) = database.withSession {
    implicit db: Session =>
      val q = Tasks.where(_.id is id)
//      q.first() // 値がなかった場合は例外が飛ぶ
      q.firstOption // 値がなかった場合は None が返る
  }

}