(Quick Reference)
                sort
Purpose
Customizes the default property to sort by for query results.
Examples
class Book {
    …
    static mapping = {
        sort "releaseDate"
    }
}Description
Usage: 
sort(string/map)By default results are sorted by creation date, and you can specify the column to order by in a query:
def results = Book.list(sort:"title")
However, you can also configure the default sort property:
static mapping = {
    sort "title"
}in which case the 
sort argument is no longer needed. You can also control the sort order:
static mapping = {
    sort title: "desc" // or "asc"
}