Scala 如何在注入MessageApi并使用I18nSupport特性时传递消息

我的控制器操作使用的自定义操作如下所示：

class ActionWithContext @Inject()(....)
  extends ActionBuilder[ContextAwareRequest] {

  def invokeBlock[A](request: Request[A], block: (ContextAwareRequest[A]) =>                   Future[Result]) = {
  ... 
  }

}

class ContextAwareRequest[A](val context: MyContext, request: Request[A]) extends WrappedRequest[A](request)

import play.api.i18n.{MessagesApi, I18nSupport, Messages}
import play.api.i18n.Messages.Implicits._
class WebsiteController @Inject() (val messagesApi: MessagesApi, actionWithContext: ActionWithContext, ..)
      extends BaseController with I18nSupport {


    def edit(websiteId: Int)  =  actionWithContext { request =>
        val model = ..
        Ok(views.html.backend.websites.edit(model)(request.context))
      }

    }

@(form: Form[controllers.WebsiteForm])(implicit context: MyContext, m: Messages) {


}

我的控制器看起来像：

class ActionWithContext @Inject()(....)
  extends ActionBuilder[ContextAwareRequest] {

  def invokeBlock[A](request: Request[A], block: (ContextAwareRequest[A]) =>                   Future[Result]) = {
  ... 
  }

}

class ContextAwareRequest[A](val context: MyContext, request: Request[A]) extends WrappedRequest[A](request)

import play.api.i18n.{MessagesApi, I18nSupport, Messages}
import play.api.i18n.Messages.Implicits._
class WebsiteController @Inject() (val messagesApi: MessagesApi, actionWithContext: ActionWithContext, ..)
      extends BaseController with I18nSupport {


    def edit(websiteId: Int)  =  actionWithContext { request =>
        val model = ..
        Ok(views.html.backend.websites.edit(model)(request.context))
      }

    }

@(form: Form[controllers.WebsiteForm])(implicit context: MyContext, m: Messages) {


}

查看页面如下所示：

class ActionWithContext @Inject()(....)
  extends ActionBuilder[ContextAwareRequest] {

  def invokeBlock[A](request: Request[A], block: (ContextAwareRequest[A]) =>                   Future[Result]) = {
  ... 
  }

}

class ContextAwareRequest[A](val context: MyContext, request: Request[A]) extends WrappedRequest[A](request)

import play.api.i18n.{MessagesApi, I18nSupport, Messages}
import play.api.i18n.Messages.Implicits._
class WebsiteController @Inject() (val messagesApi: MessagesApi, actionWithContext: ActionWithContext, ..)
      extends BaseController with I18nSupport {


    def edit(websiteId: Int)  =  actionWithContext { request =>
        val model = ..
        Ok(views.html.backend.websites.edit(model)(request.context))
      }

    }

@(form: Form[controllers.WebsiteForm])(implicit context: MyContext, m: Messages) {


}

我得到一个错误：

not enough arguments for method apply: (implicit context: com.example.services.components.MyContext, implicit m: play.api.i18n.Messages)play.twirl.api.HtmlFormat.Appendable in class edit.
[error] Unspecified value parameter m.
[error]     Ok(views.html.websites.edit(model)(request.context))
[error]                                

我尝试传入messageApi，如下所示：

 Ok(views.html.websites.edit(model)(request.context, messageApi))

但随后我得到了消息和MessageApi之间的类型不匹配错误

我该怎么办

---

p.S我甚至没有在视图中使用消息，但我使用的是表单帮助程序，我猜它在封面下使用消息…

看起来您试图显式传递一个隐式参数，隐式传递另一个参数。您必须明确地传递它们：

Ok(views.html.websites.edit(model)(request.context, implicitly[Messages]))

或者两者都隐含：

implicit val context = request.context
Ok(views.html.websites.edit(model))

---

是否可以以某种方式在myActionWithContext中添加“implicit val context=request.context”？因为每个操作都会有这个代码，如果我能避免将它添加到我的所有操作中，那就太好了。你应该能够编写一个包含类似于

隐式def request2Context（隐式请求：ContextAwareRequest）：MyContext=request.context

，然后以类似于您在

I18nSupport

中混合的方式混合该特性。请参见此以获取灵感：或者只需将

def

添加到

BaseController

。如果我没有在视图中使用消息，为什么它会期待它？这是因为表单帮助程序？我是否也可以在basecontroller中隐式地执行[消息]？不确定我是否能以某种方式注入basecontroller？