出于某种原因,就我而言,即使是简单的 Slick 表声明也不起作用。我正在使用 slick 2.10 (1.0.0),它是 maven 中央存储库中的最新版本。
case class DeviceType(id: Option[Int] = None, name: String, version: String)
object DeviceTypes extends Table[DeviceType]("device_types") {
def id = column[Int]("id", O.PrimaryKey, O.AutoInc)
def name = column[String]("name", O.NotNull)
def version = column[String]("version")
def * = id.? ~ name ~ version <> (DeviceType, DeviceType.unapply _)
def delete(device_type: DeviceType): Unit = {
database withSession { implicit session : Session =>
val dt_query = for(dt <- DeviceTypes if dt.id == device_type.id.get) yield dt
//Query(DeviceTypes).filter(_.id == device_type.id.get)
dt_query.delete
}
}
}
[warn] /home/salil/Scala/sd_ventures/app/models/DeviceType.scala:38: scala.slick.lifted.Column[Int] and Int are unrelated: they will most likely never compare equal
[warn] val dt_query = for(dt <- DeviceTypes if dt.id == device_type.id.get) yield dt
[warn] ^
And if I use Query class directly, I get the same warning:
[warn] /home/salil/Scala/sd_ventures/app/models/DeviceType.scala:38: scala.slick.lifted.Column[Int] and Int are unrelated: they will most likely never compare equal
[warn] val dt = Query(DeviceTypes).filter(_.id == device_type.id.get)
[warn] ^
有人可以告诉我为什么它不起作用吗?