scala - Play 带有枚举案例语句的框架 scala 模板

Question

我有这个 scala 模板，想使用 case 语句根据匹配的枚举值呈现不同的 html。

我的模板是这样的:

@(tagStatus: String)

 try {
   TagStatus.withName(tagStatus) match {
         case TagStatus.deployed => {<span class="label label-success">@tagStatus</span>}
         case TagStatus.deployedPartially => {<span class="label label-important">@tagStatus</span>}
         case TagStatus.deployedWithProblems => {<span class="label label-important">@tagStatus</span>}
     }
 } catch {
    {<span class="label label-important">??</span>}
 }

枚举看起来像这样:

object TagStatus extends Enumeration{
   val deployed = Value("deployed")
   val deployedWithProblems = Value("deployed_with_problems")
   val deployedPartially = Value("deployed_partially")     
}

当我运行它时，我得到:

Compilation error
')' expected but 'case' found.
In C:\...\statusTag.scala.html at line 8.
5        case TagStatus.deployed => {<span class="label label-success">@tagStatus</span>}
6        case TagStatus.deployedPartially => {<span class="label label-important">@tagStatus</span>}
7        case TagStatus.deployedWithProblems => {<span class="label label-important">@tagStatus</span>}
8    } 
9 } catch {
10    {<span class="label label-important">??</span>}
11 }

我不知道这个错误信息是什么意思。

为了编译这个简单的代码片段，我缺少什么？

谢谢!

Answer 1

toString 与 match 不兼容，因此使用 withName 将 String 转换为枚举

你可以这样做 - 我不太确定 Play 语法:

TagsStatus.withName(tagStatus) match {
  case TagStatus.deployed => {<span class="label label-success">@tagStatus</span>}
  case TagStatus.deployedPartially => {<span class="label label-important">@tagStatus</span>}
  case TagStatus.deployedWithProblems => {<span class="label label-important">@tagStatus</span>}
  case _ => {<span class="label label-important">??</span>}
}

顺便说一句，关于 Scala pattern matching with lower case variable names 有一个常见的相关问题