mongodb - 使用子类检索 Salat 对象时出现异常

Question

我有一个对象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)

创建和更新对象工作正常，但是当我尝试使用此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

这是由您的 mongo 集合中的文档引起的，该文档缺少 upgradeInfo 的值。

这里有几个选项:

1. 为 upgradeInfo 提供默认参数
2. 将 upgradeInfo 的类型更改为 Option[UpgradeInfo] 并提供默认值 None
3. 搜索您的 mongo 集合以找到损坏的文档并删除或手动修复丢失的文档 upgradeInfo