case class Developer(id: Int, name: String, email: String) {
  def rates(p: Project) = Rating(this, p, 0)
}
case class Project(uid: String, ratings: List[Rating])
case class Rating(dev: Developer, proj: Project, rating: Int) {
  def by(stars: Int) = Rating(dev, proj, stars)
  def line = s"${dev.name} gave ${proj.uid} $rating stars"
}
 
object Main extends App {
  val rodolfo = Developer(1, "John", "john@example.com")
  val jquery = Project("jquery/jquery", Nil)
  val rating = rodolfo rates jquery by 5
 
  println(rating.line)
}

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