Grails标准在联接表上的投影

我对grails criteria builder有一个问题，我想对与父表有一对多关系的表上的列进行投影示例：

Car.createCriteria() { 
   projections { 
     property('name') 
     property('wheels.name')// ???? 
   }

   join 'wheels' 
   //or wheels {} ???
}

---

还是存在类似的情况？我认为这是别名的基本问题

我假设以下域类：

class Car {
  String name
  static  hasMany = [wheels : Wheel]
}

class Wheel {
  String name
  static belongsTo = [car : Car]
}

我还假设这是期望的输出：

CarName WheelName
Car1    Wheel1
Car1    Wheel2
Car2    Wheel3

在这种情况下，您可以执行以下操作：

void testCarProjectionItg() {
  def car1 = new Car(name: 'Car1').save()
  def car2 = new Car(name: 'Car2').save()

  def wheel1 = new Wheel(name: 'Wheel1')
  def wheel2 = new Wheel(name: 'Wheel2')
  def wheel3 = new Wheel(name: 'Wheel3')

  car1.addToWheels wheel1
  car1.addToWheels wheel2     
  car2.addToWheels wheel3
  wheel1.save()
  wheel2.save()
  wheel3.save()
  car1.save()
  car2.save()

  println Wheel.withCriteria {
    projections {
      property('name')
        car {
          property('name')
        }
    }       
  }
}

--Output from testCarProjectionItg--
[[Wheel1, Car1], [Wheel2, Car1], [Wheel3, Car2]]

在这种情况下，我更喜欢HQL查询：

println Wheel.executeQuery("select car.name, wheel.name from Car car inner join car.wheels wheel")
--Output from testCarProjectionItg--
[[Car1, Wheel1], [Car1, Wheel2], [Car2, Wheel3]]

只做以下事情怎么样：

Car.createCriteria().list() { 
    createAlias("wheels","wheelsAlias")
    projections { 
        property('name') 
        property('wheelsAlias.name')
    }
}

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还是我遗漏了什么？

非常好！在演示前几分钟帮了我很大的忙！