如何將View中的參數傳遞給Lift中的代碼片段？

Question

我將使用Exploring Lift一書中稍微修改的清單4.7來問我的問題。

// In Boot.boot: 
LiftRules.viewDispatch.append { 
    case List("Expenses", "recent", acctId, authToken) => 
     Left(() => Full(RSSView.recent(acctId, authToken))) 

    // This is a dispatch via the same LiftView object. The path 
    // "/Site/news" will match this dispatch because of our dispatch 
    // method defined in RSSView. The path "/Site/stuff/news" will not 
    // match because the dispatch will be attempted on List("Site","stuff") 
    case List("Site") => Right(RSSView) 
} 

// Define the View object: 
object RSSView extends LiftView { 
    def dispatch = { 
     case "news" => siteNews 
    } 

    def recent(acctId : String, authToken : String)() : NodeSeq = { 
     // User auth, account retrieval here 
     ... 
     <lift:surround with="rss" at="content"> 
      <lift:Vote.image /> 
     </lift:surround> 
    } 

    // Display a general RSS feed for the entire site 
    def siteNews() : NodeSeq = { ... } 
} 

我如何通過acctId從視圖功能最近入段電梯：Vote.image？謝謝。

Answer 1

如果您嘗試從用戶啓動時獲取acctId和authToekn，則這不起作用。引導僅在Web應用程序啓動時運行，而不是每個用戶都運行一次。

您必須在用戶登錄時或者在檢測到自動登錄Cookie後設置SessionVar，然後在需要時訪問sessionVar。