Question

以下是我的域类

class Sender {

String senderFname;
String senderLname;
String senderPhone;

Collection receivers

static hasMany = [receivers: Receiver]
}

class Receiver {

String receiverFname;
String receiverLname;
String receiverPhone;

    static belongsTo = [sender: Sender]
}

我正在编写简单搜索功能的逻辑。

def customers() {

    println 'customers params '+params
    //def senderCriteria = Sender.createCriteria()
    def senderList = Sender.withCriteria {

        if(params.senderfname)
            like('senderFname',params.senderfname)
        if(params.senderlname)
            like('senderLname',params.senderlname)          
        if(params.senderphone)
            like('senderPhone',params.senderphone)

        createAlias("receivers", "t")

        //receivers {
            if(params.receiverfname)
                like('t.receiverFname',params.receiverfname)
            if(params.recieverlname)
                like('t.receiverLname',params.receiverlname)
            if(params.recieverphone)
                like('t.receiverPhone',params.receiverphone)
        //}


    }

    println "senderList "+senderList;

    senderList.each{ it->  println 'sender '+it
        println 'receivers '+it.receivers

    }
    //senderList = senderList.unique()
    println "senderList "+senderList;
    render(view: 'customers', model: [senderList: senderList])

}

发件人与收件人之间存在一对多的关系。我想过滤发件人对象及其相应的接收器对象。

主createCriteria返回发件人对象的预期结果。但是当我访问sender对象以获取相应的接收器时，它会再次从数据库加载所有接收器。

有没有办法解决这个问题。

Answer 1

您可以在createAlias时指定连接类型。

    createAlias("receivers", "t", org.hibernate.criterion.CriteriaSpecification.LEFT_JOIN)

在获取结果时需要禁用Grails Lazy Loading

1 个答案: