scala - * 案例类投影

Question

所以我在关注:http://slick.typesafe.com/doc/3.0.2/gettingstarted.html现在我想使用案例类而不是将每个模型定义为元组。

所以我有:

case class Character(id: Long, foreName: String, middleNames: String, lastName: String, age: Int)

//class Characters(tag: Tag) extends Table[(Int, String, String, String, Int)](tag, "characters")
class Characters(tag: Tag) extends Table[Characters](tag, "characters")
{
  def id = column[Long]("id", O.PrimaryKey, O.AutoInc)
  def foreName = column[String]("forename")
  def middleNames = column[String]("middlenames")
  def lastName = column[String]("lastname")
  def age = column[Int]("age")

//  def * = (id, foreName, middleNames, lastName, age)
  def * = (id, foreName, middleNames, lastName, age) <> (Character.tupled, Character.unapply _)
}

但是我得到:

Expression of type MappedProjection[Character, (Long, String, String, String, Int)] doesn't conform to expected type ProvenShape[Characters]

但这是为什么呢？它与:http://de.slideshare.net/rebeccagrenier509/slick-learn2 基本相同。幻灯片 7。即使这只是 Slick 2，我如何在 Slick 3 中实现同样的效果？

Answer 1

看起来您想要... extends Table[Character]，而不是... extends Table[Characters]。