Mapped projection with <> to a case class with companion object in Slick

Question

With Slick, I am trying to project database table entries directly to the case class they represent. Following the example in the documentation, I set up a mapped projection usi

Answer 1

Another way to do it is to turn the objects apply method into a tuple and pass that to the <> as shown below.

package models

import play.api._
import play.api.libs.json._
import scala.slick.driver.H2Driver.simple._

case class User(
  name: String,
  id: Option[Int] = None
)

object User {
  implicit val format = Json.format[User]
}

class UserTable(tag: Tag) extends Table[User](tag, "USERS") {
  def id = column[Int]("ID", O.PrimaryKey, O.AutoInc)
  def name = column[String]("NAME", O.NotNull)

  def * = (name, id.?) <> ((User.apply _).tupled, User.unapply)
}

object Users extends TableQuery(new UserTable(_)) {
  val findByID = this.findBy(_.id)
}