Traits in Scala

traits.scala

trait Searchable {
  def search(query: SearchQuery): Seq[SearchResults]
}

trait PaginationWithNominalType {
  this: Searchable =>
  def page(query: SearchQuery, pageSize: Int, pageNum: Int) = {
    search(query).grouped(pageSize).toList(pageNum)
  }
}

trait PaginationWithStructuralType {
  this: { def search(query: SearchQuery): Seq[SearchResults] }
  def page(query: SearchQuery, pageSize: Int, pageNum: Int) = {
    search(query).grouped(pageSize).toList(pageNum)
  }
}

trait PaginationWithAbstractMethod {
  def search(query: SearchQuery): Seq[SearchResults]
  def page(query: SearchQuery, pageSize: Int, pageNum: Int) = {
    search(query).grouped(pageSize).toList(pageNum)
  }
}