abelbryo

object UserEntityModule { 
  case class UserEntityF[F[_], G[_]](id: G[Option[Long]] = None, username: F[String], password: F[String])

  type Id[A] = A
  type Forget[A] = Unit

  // You can also just use Option if you don't care
  // for the domain-specific type
  sealed trait Updatable[+A] {
    def foreach(f : A => Unit): Unit = this match {

abelbryo

import play.api.libs.functional.syntax._
import play.api.libs.json._

// Example showing different use cases
// of json formatting with Play-Json library

// case class with parameters
final case class DataType[T](value: T)
object DataType {
  implicit def anyDataTypeJsonFmt[T: Format]: Format[DataType[T]] = {