grails - Grails域中的 transient 属性

我有一个名为People的Grails域，我想检查每个People是否有 child 。子项是其他“人”对象。这是我的域结构:

class People implements Serializable {

    static constraints = {
        name (nullable : false, unique : true)
        createdBy (nullable : false)
        creationDate (nullable : false)
    }

    static transients = ['hasChild']

    static mapping = {
        table 'PEOPLE'
        id generator: 'sequence', params : [sequence : 'SEQ_PK_ID']
        columns {
            id column : 'APEOPLE_ID'
            parentPeople column : 'PARENT_PEOPLE_ID'
        }
        parentPeople lazy : false
    }

    People parentPeople
    String name
    String description

    Boolean hasChild() {
        def childPeoples = People.createCriteria().count {
            eq ('parentPeople', People)
        }
        return (childPeoples > 0)
    }
}

但是我无法在任何地方调用people.hasChild()。你能帮我这个忙吗？非常感谢!

最佳答案

这是因为在eq ('parentPeople', People)中，Grails无法理解“人”是什么(这是一个类)。您应该用this替换“People”。例如:

static transients = ["children"]

    def getChildren() {
        def childPeoples = People.findAllByParentPeople(this, [sort:'id',order:'asc'])
    }