return map for criteria

http://stackoverflow.com/questions/32237680/is-there-any-way-to-return-a-map-with-some-fields-from-a-createcriteria-in-grail

you can use import org.hibernate.criterion.CriteriaSpecification with withCriteria() to transform the result in a Collection object, with properties chosen by you only:

import org.hibernate.criterion.CriteriaSpecification

def criteria = User.withCriteria(){
    resultTransformer CriteriaSpecification.ALIAS_TO_ENTITY_MAP
    createAlias 'personalData', 'p'
    eq 'id', params.id
    // ...and so on, then
    projections {
        property 'id', 'myId' // a property called 'myId', from User
        property 'p.name', 'userName' // from personalData, a property mapped by a fk in User
        property 'p.age', 'age'
    }
}
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