Question

大家好我是新玩的框架，如果有人知道下面提到的更好的方法，请告诉我。

所以我有一个模型和它的读/写/格式

case class Schedule (startDate: DateTime, endDate: DateTime)


object ScheduleSerializers {


  val userDateFormatter = "dd/MM/yyyy HH:mm:ss"
  val nonImplicitUserFormatter = DateTimeFormat.forPattern("dd/MM/yyyy HH:mm:ss")
  implicit val jodaDateTimeReads = Reads.jodaDateReads(userDateFormatter)
  implicit val jodaDateTimeWrites = Writes.jodaDateWrites(userDateFormatter)

  implicit val readSchedule: Reads[Schedule] = (
    (__ \ "startDate").read[String].map[DateTime](dt => DateTime.parse(dt, nonImplicitUserFormatter)) and
      (__ \ "endDate").read[String].map[DateTime](dt => DateTime.parse(dt, nonImplicitUserFormatter))
    )(Schedule)

  implicit val writeSchedule: Writes[Schedule] = (
    (__ \ "startDate").write[String].contramap[DateTime](dt => nonImplicitUserFormatter.print(dt)) and
      (__ \ "endDate").write[String].contramap[DateTime](dt => nonImplicitUserFormatter.print(dt))
    )(unlift(Schedule.unapply))

  implicit val formatSchdule = Format(readSchedule, writeSchedule)

}

现在我打开播放控制台并执行此操作

val sch = Json.parse(""" {
     | 
     |   "schedule" : { "starDate" : "04/02/2011 20:27:05" , "endDate" : "04/02/2011 20:27:05" }
     | }
     | """)
sch: play.api.libs.json.JsValue = {"schedule":{"starDate":"04/02/2011 20:27:05","endDate":"04/02/2011 20:27:05"}}

sch.validate[Schedule]
res0: play.api.libs.json.JsResult[models.experiment.Schedule] = JsError(List((/endDate,List(ValidationError(error.path.missing,WrappedArray()))), (/startDate,List(ValidationError(error.path.missing,WrappedArray())))))

我收到错误，但如果我尝试解析ex：

的单个日期

scala> val singleDate = Json.parse(""" "04/02/2011 20:27:05" """)
singleDate: play.api.libs.json.JsValue = "04/02/2011 20:27:05"

singleDate.validate[DateTime]
res1: play.api.libs.json.JsResult[org.joda.time.DateTime] = JsSuccess(2011-02-04T20:27:05.000-08:00,)

我很困惑为什么＆＃39; singleDate＆＃39;但是可以在＆＃39; Schedule＆＃39;上进行验证。模型失败。在此先感谢，任何帮助将不胜感激。

Answer 1

错误很明显：“路径缺失”。

而不是：

 (__ \ "startDate") ...
 (__ \ "endDate") ...

你必须提供真正的道路：

 (__ \ "schedule" \ "startDate") ...
 (__ \ "schedule" \ "endDate") ...

顺便说一下，当您将jodaDateTimeReads定义为implicit时，您无需手动执行此操作。当您的读写操作相同时，请使用Format。

这应该足够了：

implicit val formatSchedule: Format[Schedule] = (
  (__ \ "startDate").read[DateTime] and
  (__ \ "endDate").read[DateTime]
)(Schedule.apply, unlift(Schedule.unapply)))

Answer 2

试试这些：

implicit val dateWrites = jodaDateWrites("yyyy-MM-dd'T'HH:mm:ss.SSSZ")
implicit val dateReads = jodaDateReads("yyyy-MM-dd'T'HH:mm:ss.SSSZ")

https://github.com/playframework/playframework/blob/master/framework/src/play-json/src/main/scala/play/api/libs/json/Writes.scala#L411

https://github.com/playframework/playframework/blob/master/framework/src/play-json/src/main/scala/play/api/libs/json/Reads.scala#L645

Json Coast to Coast Play框架：序列化Joda DateTime

2 个答案: