minimum DDD base

gistfile1.scala

class Id[V](val id: V)

trait Entity[T <: Id[_]] {
  val id: T
}

case class User(id: Id[String]) extends Entity[Id[String]]

trait Repository[ID <: Id[_], E <: Entity[ID]] {
  def find(id: ID): E
  def add(entity: E): E
  def delete: E
}

class UserRepository extends Repository[Id[String], User]{
  def find(id: Id[String]): User = ???
  def add(entity: User): User = ???
  def delete: User = ???
}