blog_practical_cats_06.scala

def getCountryByUserId(id: Int): Future[Either[String, Country]] = {
  val result = for {
    user <- EitherT(getUser(id))
    city <- EitherT(getCity(user))
    country <- EitherT(getCountry(city))
  } yield {
    country
  } 
  result.value
}