播放2.5迁移错误:使用BodyParser自定义操作:找不到参数mat的隐式值:akka.stream.Materializer

Question

我有一个Play Framework应用程序,版本2.4迁移到2.5,一切都完成了!但在使用BodyParser的自定义操作中抛出错误,

 def isAuthenticatedAsync[A](parser: BodyParser[A])(f: => Long => Request[A] => Future[Result]) = {
Security.Authenticated(userId, onUnauthorized) { user =>
  Action.async(parser)(request => f(user)(request))
}

}

用这个:

def upload = isAuthenticatedAsync(parse.maxLength(5 * 1024 * 1024, parse.multipartFormData)) { userId => request =>
//Logger.info(s"")
request.body match {
  case Left(MaxSizeExceeded(length)) => Future(BadRequest(Json.toJson(ResultTemp("Your file is too large, we accept just " + length + " bytes!"))))
  case Right(multipartForm) =>

抛出错误:

could not find implicit value for parameter mat: akka.stream.Materializer

[error] def upload = Action.async(parse.maxLength(5*1024*1024,parse.multipartFormData)){request =>

Answer 1

看起来你需要在控制器中注入一个物质化器

class MyController @Inject() (implicit val mat: Materializer) {}