如何从grails中的映射表中获取值？

Question

我已经在grails中创建了一个域类，它按照代码中的提法映射到vehicleList。现在我想获得家庭id = 1的车辆列表。我可以使用familyInstance.vehicleList来获取此信息。

但我想知道有没有其他方法可以解决这个问题。我尝试应用标准但createCriteria和withCriteria在我提到arrayIndexOutOfBound的投影中显示错误property("vehicleList")错误。应用基本的MySql查询我可以直接从映射表中获取数据但是如果我想使用条件获取这些数据如何做到这一点。

class Family {

    String name

    Integer noOfVehicle

    List vehicleList

    static hasMany = [vehicleList: String]

    static constraints = {
    }
}



class FamilyController {

 def edit(Family familyInstance) {

        def fi = familyInstance
        println "familyInstance ::: " + familyInstance

        //Try 1
        def familyCriteria = Family.createCriteria()
        def vehicleList = familyCriteria.list{
            createAlias('vehicleList','vlist')
            projections {
                property('vehicleList')
            }
            eq('id',familyInstance.id)
        }
        println "vehicleList ::: " + vehicleList

        //Try 2
        def vehicleList1 = familyInstance.vehicleList
        println "vehicleList1 ::: " + vehicleList1

        //Try 3
        def vehicleList2 = Family.withCriteria{
            createAlias('vehicleList','vlist')
            projections{
                property('vehicleList')
            }
            eq('id',familyInstance.id)
        }
        println "vehicleList2 ::: ===------>>>>>" + vehicleList2
        respond familyInstance
    }
}

数据库结构：

Error with projections

Answer 1

删除createAlias声明

Family.createCriteria().list{
    projections {
        property('vehicleList')
    }
    eq('id', familyInstance.id)
}

作品