斯卡拉讀取播放JSON和LocalDateTime上構建

Question

我有一個簡單的案例類的位置（這是相當多的ScalaJsonCombinators教程）

// controller 
implicit val locationWrites: Writes[Location] = 
(
    (JsPath \ "latitude").write[Double] and 
    (JsPath \ "longitude").write[Double] 
) (unlift(Location.unapply)) 

implicit val locationReads: Reads[Location] = 
(
    (JsPath \ "latitude").read[Double] and 
    (JsPath \ "longitude").read[Double] 
) (Location.apply _) 

// model 
case class Location(latitude: Double, longitude: Double) 

object Location { 
    implicit val formatter = Json.format[Location] 
} 

我想設置施工當前的時間，讓自己的位置看起來像：

case class Location(latitude: Double, longitude: Double, date: LocalDateTime) 

可惜我不能真正弄清楚如何使用Play JSON來傳遞LocalDateTime.now（），而不發送附加字段或實際如何通過LocalDateTime一般。

請求主體

{ 
    "latitude": ... 
    "longitude": ... 
} 

Answer 1

，而不是傳遞Location.unapply/Location.apply到FunctionalBuilder你可以通過自己的函數：

case class Location(latitude: Double, longitude: Double, date: LocalDateTime) 

implicit val locationWrites: Writes[Location] = 
(
    (JsPath \ "latitude").write[Double] and 
    (JsPath \ "longitude").write[Double] 
) ((l: Location) => (l.latitude, l.longitude)) 

implicit val locationReads: Reads[Location] = 
(
    (JsPath \ "latitude").read[Double] and 
    (JsPath \ "longitude").read[Double] 
) ((lat: Double, lon: Double) => Location(lat, lon, LocalDateTime.now()))