Scala-提升-映射自定义盒装对象以进行绑定? [英] Scala - Lift - map a custom boxed object for bind?

问题描述

好，所以我有一个自定义对象，它是一个myUser.

Ok, so i have a custom object that is a myUser.

myUser看起来像这样:

myUser looks like this :

username:String = ""
firstname:String = ""
lastname:String = ""

我有进入页面的这些用户的列表，我建立了一个链接，以查看每个用户的详细信息.当您单击某个用户时，它将填充我作为请求变量的装箱的对象，然后直接进入详细信息页面以查看此用户信息.为什么我不能从该对象的地图上绑定?这是一些代码...

I have a list of these users that come into a page, I've made a link to view the details of each user. When you click on a user, it will fill the boxed object that I have as a request var, and then direct to the detail page to view this user information. Why is that I can't bind from a map on this object? Here is some code...

private object selectedUser extends RequestVar[Box[myUser]](Empty)

def getusers(html: NodeSeq):NodeSeq = {

    //This gets me a list of 10 users that are "myUser" objects
    val userList = User.getUsers(10)

    userList.flatMap{user => bind("user", html,
        "username" -> SHtml.link("/%2Fadmin%2Fdetail", () => selectedUser(Full(user)), Text(user.username)),
        "firstname" -> {user.firstname},
        "lastname" -> {user.lastname},
        "lastloggedin" -> {user.lastloggedin})}
}

现在，当我到达用户详细信息页面时，我想映射出我已经编写的selectedUser对象....但是由于某种原因，我无法使其正常工作，这给了我这个错误:

Now when I arrive at the user detail page, I want to map out the selectedUser object i've written....but for some reason, I can't get it to work, it's giving me this error :

类型不匹配；成立 : net.liftweb.common.Box [scala.xml.NodeSeq] 必需:scala.xml.NodeSeq

type mismatch; found : net.liftweb.common.Box[scala.xml.NodeSeq] required: scala.xml.NodeSeq

这是给我这个错误的代码:

Here is the code that's giving me this error :

def userdetail(html: NodeSeq):NodeSeq = {
    selectedUser.is.map{user => bind("user", html, 
        "username" -> {user.username},
        "firstname" -> {user.firstname},
        "lastname" -> {user.lastname},
        "lastloggedin" -> {user.lastloggedin})}
}

有趣的是，我可以这样做，并且可以正常工作，但是必须有一种方法可以在一行上完成它吗?

The interesting thing is, i can do it this way, and it will work, but there has got to be a way to do it on one line right?

这可行...但是很麻烦:

This works...but it's cumbersome :

def userdetail(html: NodeSeq):NodeSeq = {

    var username = ""
    var firstname = ""
    var lastname = ""
    var lastloggedin = ""

    bind("user", html, 
        "username" -> {username},
        "firstname" -> {firstname},
        "lastname" -> {lastname},
        "lastloggedin" -> {lastloggedin})
}

有人可以告诉我我在这里想念的小东西吗?我希望我能足够清楚地解释自己.

Can someone please tell me the little thing i'm missing here? I hope I explained myself clearly enough.

谢谢！

推荐答案

这将为您提供一个空的NodeSeq，前提是没有selectedUser，否则将为绑定结果.

This will give you an empty NodeSeq iff there is no selectedUser and the result of the bind otherwise.

def userdetail(html: NodeSeq):NodeSeq = {
    selectedUser.is.toList.flatMap{user => bind("user", html, 
        "username" -> {user.username},
        "firstname" -> {user.firstname},
        "lastname" -> {user.lastname},
        "lastloggedin" -> {user.lastloggedin})}
}

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