Slick MappedColumnType

Question

我想在我的代码中添加一个案例类SupplierID。我想通过自动映射SupplierID和Int Types来简化*方法。

  case class SupplierID(id: Int)

  case class Supplier(id: SupplierID, name: String, street: String, city: String, state: String, zip: String)
  // Definition of the SUPPLIERS table using case class
  class Suppliers(tag: Tag)  extends Table[Supplier](tag, "SUPPLIERS") {
    def id = column[Int]("SUP_ID", O.PrimaryKey) // This is the primary key column
    def name = column[String]("SUP_NAME")
    def street = column[String]("STREET")
    def city = column[String]("CITY")
    def state = column[String]("STATE")
    def zip = column[String]("ZIP")

    def * ={
      (id, name, street, city, state, zip).shaped.<>({ tuple => Supplier.apply(SupplierID(tuple._1), tuple._2, tuple._3, tuple._4, tuple._5, tuple._6 )}, {
        (s : Supplier) => Some{(s.id.id, s.name, s.street, s.city, s.state, s.zip)}
      })
    }

  }

我正在尝试实现类似

的列类型

 // And a ColumnType that maps it to Int
  implicit val SupplierIDColumnType = MappedColumnType.base[SupplierID, Int](
     s => s.id,    // map Bool to Int
     i => SupplierID(i) // map Int to Bool
  )

如何使用这种mappingtype？

Answer 1

解决方案：

case class SupplierID(id: Int)

  // And a ColumnType that maps it to Int
  implicit val SupplierIDColumnType = MappedColumnType.base[SupplierID, Int](
     s => s.id,    // map SupplierID to Int
     i => SupplierID(i) // map Int to SupplierID
  )

  case class Supplier(id: SupplierID, name: String, street: String, city: String, state: String, zip: String)
  // Definition of the SUPPLIERS table using case class
  class Suppliers(tag: Tag)  extends Table[Supplier](tag, "SUPPLIERS") {
    def id = column[SupplierID]("SUP_ID", O.PrimaryKey) // This is the primary key column
    def name = column[String]("SUP_NAME")


       def street = column[String]("STREET")
        def city = column[String]("CITY")
        def state = column[String]("STATE")
        def zip = column[String]("ZIP")

        def * = (id, name, street, city, state, zip) <>(Supplier.tupled , Supplier.unapply _)

  }