Play 2.6 消息迁移

Question

我目前正在尝试将项目从 Play 2.5 迁移到 Play 2.6，并已阅读此 docs 以迁移消息 API。我仍然收到错误消息：

An implicit Messages instance was not found.

当尝试像这样创建自定义错误处理程序时：

class ErrorHandler @Inject()(
  env: Environment,
  conf: Configuration,
  sourceMapper: OptionalSourceMapper,
  router: Provider[Router],
  override val messagesApi: MessagesApi
) extends DefaultHttpErrorHandler(env, conf, sourceMapper, router) with I18nSupport {

  // ...

}

Answer 1

特征I18nSupport 将能够提供Messages 实例。但为此它需要在其范围内有一个implicit request：

implicit def request2Messages(implicit request: RequestHeader): Messages

确保您已将您的请求标记为implicit