In order to use the XMLApiHelper trait, you must define an outer-most XML
Elem that will wrap the response.
For example:
def createTag(in: NodeSeq): Elem = <foo_co_rest>{in}</foo_co_rest>
Now... if your stuff already does the wrapping in the outer-most Elem, you
can do:
def createTag(in: NodeSeq): Elem = in.flatMap{case e: Elem => List(e) case _
=> Nil}.firstOption getOrElse <blank/>
On Thu, Oct 8, 2009 at 10:36 AM, Alex Black <[email protected]> wrote:
>
> I'm getting started with Scala and Lift, implementing a simple REST
> service. I've extended XMLApiHelper, following examples in "Exploring
> Lift", but I'm getting a compile error I'm not sure about, any
> suggestions?
>
> error:
>
> class RestAPI needs to be abstract, since method createTag in trait
> XMLApiHelper of type (scala.xml.NodeSeq)scala.xml.Elem is not defined
> RestAPI.scala /poc/src/main/scala/com/somecompany/api Unknown Scala
> Problem
>
> So its telling me I have to implement createTag... but, I don't know
> how to :) Also, the examples i've seen don't seem to implement it,
> making me think I'm doing something wrong.
>
> package com.somecompany.api
>
> import _root_.net.liftweb.util._
> import _root_.net.liftweb.http._
> import Helpers._
>
> import net.liftweb.http.rest.XMLApiHelper
>
> class RestAPI extends XMLApiHelper {
> def dispatch: LiftRules.DispatchPF = {
>
> case Req(List("api", "camera", cameraId), "", DeleteRequest) =>
> () => deleteCamera(cameraId)
>
> // Invalid API request - route to our error handler
> case Req(List("api", _), "", _) => failure _
> }
>
> def failure : LiftResponse = BadResponse()
>
> def deleteCamera(cameraId : String) : LiftResponse = {
> NoContentResponse()
>
> }
>
> }
>
> Thanks!
>
> - Alex
>
> >
>
--
Lift, the simply functional web framework http://liftweb.net
Beginning Scala http://www.apress.com/book/view/1430219890
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