问光滑3事务如何

EN

  def findById(id: Long): DBIO[Option[Project]] =
Projects.filter(_.id === id).result.headOption

  def insert(Task: Task): DBIO[Long] =
Tasks returning Tasks.map(_.id) += Task

def addTaskToProject(taskName: String, projectId: Long) = Action.async { implicit rs =>

  val query = for {
    Some(project) <-  projectDAO.findById(projectId)
    id <- taskDAO.insert(Task(0, "blue", project.id))
  }yield id

  val result = dbConfig.db.run(query)

  result.map{ taskId =>
    Ok("I have created a new task: " + taskId)
  }
}

val result = dbConfig.db.run(query).transactionally

... value transactionally is not a member of scala.concurrent.Future[Long]

val result = dbConfig.db.run(query.transactionally)

... value transactionally is not a member of slick.dbio.DBIOAction[Long,slick.dbio.NoStream,slick.dbio.Effect.All with slick.dbio.Effect.All]