检索具有子类的Salat对象时出现异常

Question

我有一个对象，它有一个子类作为属性：

case class UpgradeInfo(
    @EnumAs upgradeType: UpgradeType.Value,
    @EnumAs timeUnit: TimeUnit.Value,
    timeQuantity: Int,
    start: Date,
    end: Date)

case class Upgrade(
    @Key("_id") id: ObjectId = new ObjectId,
    adId: ObjectId,
    upgradeInfo: UpgradeInfo,
    price: Double)

创建和更新对象很好，但是当我尝试用下面的代码检索升级对象时(应该检索所有升级对象)：

UpgradeDAO.find(MongoDBObject()).toList

我得到以下异常：

[error]     Exception: class models.entities.Upgrade requires value for 'upgradeInfo' (Grater.scala:402)
[error] com.novus.salat.DefaultArg.safeValue$lzycompute(Grater.scala:406)
[error] com.novus.salat.DefaultArg.safeValue(Grater.scala:402)
[error] com.novus.salat.ConcreteGrater.safeDefault(Grater.scala:363)
[error] com.novus.salat.ConcreteGrater$$anonfun$5$$anonfun$apply$3.apply(Grater.scala:262)
[error] com.novus.salat.ConcreteGrater$$anonfun$5$$anonfun$apply$3.apply(Grater.scala:262)
[error] com.novus.salat.ConcreteGrater$$anonfun$5.apply(Grater.scala:262)
[error] com.novus.salat.ConcreteGrater$$anonfun$5.apply(Grater.scala:247)
[error] com.novus.salat.ConcreteGrater.asObject(Grater.scala:247)
[error] com.novus.salat.dao.SalatMongoCursorBase$class.next(SalatMongoCursor.scala:45)
[error] com.novus.salat.dao.SalatMongoCursor.next(SalatMongoCursor.scala:151)
[error] com.novus.salat.dao.SalatMongoCursor.foreach(SalatMongoCursor.scala:151)
[error] com.novus.salat.dao.SalatMongoCursor.to(SalatMongoCursor.scala:151)
[error] com.novus.salat.dao.SalatMongoCursor.toList(SalatMongoCursor.scala:151)
[error] models.entities.UpgradeDAO$.find(Upgrade.scala:47)
[error] models.UpgradeSpecs$$anonfun$1$$anonfun$apply$28$$anonfun$apply$29.apply(UpgradeSpecs.scala:129)
[error] models.UpgradeSpecs$$anonfun$1$$anonfun$apply$28$$anonfun$apply$29.apply(UpgradeSpecs.scala:128)
[error] play.api.test.Helpers$.running(Helpers.scala:40)
[error] models.UpgradeSpecs$$anonfun$1$$anonfun$apply$28.apply(UpgradeSpecs.scala:128)
[error] models.UpgradeSpecs$$anonfun$1$$anonfun$apply$28.apply(UpgradeSpecs.scala:128)

知道我做错了什么吗？

Answer 1

这是由mongo集合中缺少upgradeInfo值的文档引起的。

这里有几个选项：

mongo集合提供了一个默认参数upgradeInfo

• change of

• to upgradeInfo to Option[UpgradeInfo]，并提供了默认值None

• search mongo集合，以查找损坏的文档并移除或手动修复缺少upgradeInfo的文档。