Get a list of ids, and show the elements. This code is too damn long for this simple task. Improvements?

gistfile1.groovy

    def showContents(){
        def contents = []
        def ids = params.list('id').findAll { it.isLong() }*.toLong()
        if (ids) {
            contents = Content.createCriteria().list {
                'in' 'id', ids
            }
        }
        render view:'showContents', model:[contents:contents]
    }

Si no funciona el metodo "getAll" puedes usar "findAllByIdInList" que debería comportarse igual