Scala 在play 2.6中，WebSocket缺少自定义数据类型的隐式消息流转换器

我试图在客户端和服务器之间建立web套接字连接，但数据类型需要隐式MessageFlowTransformer，播放文档仅介绍字符串和JsValue转换，我有以下数据类型：

sealed trait InEvent
sealed trait outEvent

  final case class AckInEevent(serial: Long) extends InEvent
  final case class AckOutEevent(serial: Long) extends outEvent

我有一个错误指示

could not find implicit value for parameter transformer: play.api.mvc.WebSocket.MessageFlowTransformer[InEvent, outEvent]

试一试

libraryDependencies+=“org.julienrf”%%“播放json派生的编解码器”%%“6.0.0”

---

谢谢，如果我使用Argonaut编码和解码，Json.Format将不会work@med10在Play framework中，您应该使用Play json，而不是Circe、Argonaut、Jackson、µPickle或其他任何东西。否则，您必须自己实现不同库的类型类之间的转换

could not find implicit value for parameter transformer: play.api.mvc.WebSocket.MessageFlowTransformer[InEvent, outEvent]

sealed trait InEvent
sealed trait outEvent

final case class AckInEevent(serial: Long) extends InEvent
final case class AckOutEevent(serial: Long) extends outEvent

import play.api.libs.json._
implicit val ackInEeventFormat = Json.format[AckInEevent]
implicit val ackOutEeventFormat = Json.format[AckOutEevent]
implicit val inEeventFormat = Json.format[InEvent]
implicit val outEeventFormat = Json.format[outEvent]

implicit val messageFlowTransformer =
  MessageFlowTransformer.jsonMessageFlowTransformer[InEvent, outEvent]

def accept = WebSocket.tryAcceptWithActor[InEvent, outEvent] { request => ???}