grails projections with alias and left outer join

projections.groovy

            def criteria = Spot.createCriteria()
            def result = criteria.list {
                eq("slide.id", params.long("id"))
                createAlias('layoutSpot', 'lSpot', CriteriaSpecification.LEFT_JOIN)
                createAlias('lSpot.sample', 'smpl', CriteriaSpecification.LEFT_JOIN)
                projections {
                    property "id"
                    property "signal"
                    property "block"
                    property "row"
                    property "col"
                    property "smpl.name"
                    property "smpl.type"
                    property "smpl.target"
                }
                order('block', 'asc')
                order('row', 'desc')
                order('col', 'asc')
            }