Example paging enumerator using Play! WS.

paging.scala

import play.api.libs.ws._
import play.api.libs.iteratee._

def pagingEnumerator(url:String):Enumerator[JsValue]={ 	
  	var maybeNextUrl = Some(url) //Next url to fetch	
	Enumerator.fromCallback[JsValue] ( retriever = {
        val maybeResponsePromise = 
            maybeNextUrl map { nextUrl=>	        		                           
                WS.url(nextUrl).get.map { reponse =>
                    val json = response.json
                    maybeNextUrl = (json \ "next_url").asOpt[String] 
                    val code = response.status //Potential error handling here
                    json
                }	                
            }

        /* maybeResponsePromise will be an Option[Promise[JsValue]]. 
         * Need to 'flip' it, to make it a Promise[Option[JsValue]] to 
         * conform to the fromCallback constraints */
        maybeResponsePromise match {
            case Some(responsePromise) => responsePromise map Some.apply
            case None                  => PlayPromise pure None
        }
    })
}