播放2.5遷移錯誤：與BodyParser自定義操作：找不到參數墊內含價值：akka.stream.Materializer

Question

我有一個播放框架應用，2.4版本遷移到2.5，一切搞定！但拋出一個錯誤，在我的自定義操作與BodyParser，

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

}

使用此：

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) => 

拋出一個錯誤：

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

[錯誤]高清upload = Action.async（parse.maxLength（5 * 1024 * 1024，parse.multipartFormDa TA））{請求=>

Answer 1

看起來你需要注入materializer在控制器

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