It seems that there are two different ways of declaring sorted associations in Grails :

Method 1 (see here) using default sort order

class Book {
  String title 
}
class Author {
  static hasMany = [books : Book]
  static mapping = { books sort: "title"}
}

Method 2 (see here) using SortedSet

class Book implements Comparable {
  String title
  int compareTo(obj) {
    title <=> obj.title
  }
}
class Author {
  SortedSet books
  static hasMany = [books : Book]
}

I am not sure which one to use and what is the difference (if any), pros and cons between using one against the other.

I would appreciate any clarification.

Thank you