https://stackoverflow.com/questions/72869532/how-to-utilize-sortablecolumn-in-grails

gistfile1.txt

// I don't think there are scenarios where this is the best thing to do...

def donors = Donor.createCriteria().list(){
    eq('event', event)
}

if(params.sort == "firstName"){
    if(params.order == "asc"){
        donors.sort {it.firstName}
    } else {
        Collections.reverse(donors.sort {it.firstName})
    }
}