Grails | Groovy | Create Criteria | Hibernate Criteria Builder | Custom Criteria Order | Custom Sort By | Custom Order Criteria

Grails | Groovy | Create Criteria | Hibernate Criteria Builder | Custom Criteria Order | Custom Sort By | Custom Order Criteria. 

In Grails we may need sometime to add sort / order by with some aggregate function as sum of two fields. Suppose we have a Grails / Groovy domain which has two field named "amount" and "tax", now we want to sort by sum of these two fields. So we can do that using below sample code: 

import groovy.lang.Closure
import org.hibernate.Criteria
import org.hibernate.HibernateException
import org.hibernate.criterion.CriteriaQuery
import org.hibernate.criterion.Order as CriterionOrder

Closure closure = {
    addOrder(new CriterionOrder("amount", params.dir) {
        @Override
        String toSqlString(Criteria criteria, CriteriaQuery criteriaQuery) throws HibernateException {
        return "(this_.amount + this_.tax) asc"
        }
    })
    projections {
        property("id")
        property("amount")
    }
}
List list = Domain.createCriteria().list {
    and closure
}