我正在尝试使用ObjectMapper将对象反序列化为JSON字典但是反序列化函数总是返回空对象。classTimeEntryContainer:Mappable{//MARK:Propertiesvarentry:TimeEntryObject=TimeEntryObject()//MARK:Initializersinit(){}init(_issue:Issue,hours:Double,activityId:Int){self.entry=TimeEntryObject(issue,hours:hours,activityId:activityId)}requiredinit?