refactoring on mongodb objects (collection, session)

server/src/main/scala/server/Servlet.scala

 package org.openmole.gate.server
 
-import com.mongodb.{MongoCredential, ServerAddress}
+import com.mongodb.{DBObject, MongoCredential, ServerAddress}
 import com.mongodb.casbah.Imports.{MongoCollection, MongoDBObject}
 import com.mongodb.casbah.MongoClient
 import org.openmole.gate.server.Data.User
@@ -32,19 +32,22 @@ class Servlet(mongoDB: MongoDB) extends ScalatraServlet with AuthenticationSuppo
     tags.link(tags.rel := "stylesheet", tags.`type` := "text/css", href := "css/bootstrap.min.css"),
     tags.script(tags.`type` := "text/javascript", tags.src := "js/gate.js")
   )
-  val userSession = MongoDBObject(user.login -> session.getId)
-  println(mongoDB.host + " => " + mongoDB.port)
-  val server = new ServerAddress(mongoDB.host, mongoDB.port)
-  val credentials = MongoCredential.createCredential("accountUser", "products", "password".toCharArray)
-  val mongoClient = MongoClient(server, List(credentials))
-  println(mongoDB.db + " ? " + mongoDB.dataSet)
-  val mongoCollection = mongoClient(mongoDB.db)(mongoDB.dataSet)
-
+  case class MongoData(collection: MongoCollection, userSession: DBObject)
+  def getMongoData(user:User) = {
+    val userSession = MongoDBObject(user.login -> session.getId)
+    println(mongoDB.host + " => " + mongoDB.port)
+    val server = new ServerAddress(mongoDB.host, mongoDB.port)
+    val credentials = MongoCredential.createCredential("accountUser", "products", "password".toCharArray)
+    val mongoClient = MongoClient(server, List(credentials))
+    println(mongoDB.db + " ? " + mongoDB.dataSet)
+    MongoData(mongoClient(mongoDB.db)(mongoDB.dataSet), userSession)
+  }
   get("/") {
     contentType = "text/html"
     auth("DB") match {
       case Some(user) =>
-        mongoCollection.findOne(userSession) match {
+        val mongoData = getMongoData(user)
+        mongoData.collection.findOne(mongoData.userSession) match {
           case Some(x) =>
             tags.html(
               head,
@@ -54,7 +57,7 @@ class Servlet(mongoDB: MongoDB) extends ScalatraServlet with AuthenticationSuppo
               )
             )
           case None =>
-            mongoCollection += userSession
+            mongoData.collection += mongoData.userSession
             tags.html(
               head,
               tags.body(