枚舉的框架scala模板與case語句

Question

我有這個scala模板，並希望使用case語句根據匹配的枚舉值呈現不同的html。

我的模板看起來是這樣的：

@(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>} 
} 

枚舉看起來是這樣的：

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

當我運行此我得到：

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 } 

我不知道是什麼是由這個錯誤信息。

我爲了得到這個簡單的代碼片段而錯過了什麼？

謝謝！

Answer 1

的toString是不匹配兼容，所以使用withName

的字符串轉換爲枚舉你可以做到這樣的 - 我不太清楚播放的語法：

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>} 
} 

順便說一句，有一個共同的相關問題Scala pattern matching with lower case variable names

Answer 2

你不必在這裏使用試試，只需要匹配你的通配符（參見：http://www.playframework.com/documentation/2.1.x/ScalaTemplateUseCases）。

@(tagStatus: String) 

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