diff --git a/examples/sprest-reactivemongo-example/build.sbt b/examples/sprest-reactivemongo-example/build.sbt
index 5c1d191..d7cc6a0 100644
--- a/examples/sprest-reactivemongo-example/build.sbt
+++ b/examples/sprest-reactivemongo-example/build.sbt
@@ -4,7 +4,7 @@ resolvers += "Typesafe Repository" at "http://repo.typesafe.com/typesafe/release
 
 resolvers += "Sonatype Snapshots" at "https://oss.sonatype.org/service/local/repositories/snapshots/content"
 
-resolvers += "Sprest Snapshots" at "http://sprest.io/snapshots"
+resolvers += "Sprest Releases" at "http://sprest.io/releases"
 
 scalaVersion := "2.10.4"
 
@@ -17,7 +17,7 @@ libraryDependencies ++= Seq(
   "ch.qos.logback" % "logback-classic" % "1.1.2",
   "joda-time" % "joda-time" % "2.3",
   "org.joda" % "joda-convert" % "1.6",
-  "sprest" %% "sprest-reactivemongo" % "0.3.4-SNAPSHOT",
+  "sprest" %% "sprest-reactivemongo" % "0.3.8",
   "org.specs2" %% "specs2" % "2.3.10" % "test"
 )
 
diff --git a/examples/sprest-reactivemongo-example/src/main/coffee/main.coffee b/examples/sprest-reactivemongo-example/src/main/coffee/main.coffee
index 0fb392c..65d5f7b 100644
--- a/examples/sprest-reactivemongo-example/src/main/coffee/main.coffee
+++ b/examples/sprest-reactivemongo-example/src/main/coffee/main.coffee
@@ -8,7 +8,7 @@ window.ToDos = ($scope, $resource, $http) ->
     
   $scope.todos = ToDo.query()
   $scope.addTodo = ->
-    toAdd = new ToDo({text: $scope.todoText, done: false, priority: $scope.todoPriority})
+    toAdd = new ToDo({id: 'new', text: $scope.todoText, done: false, priority: $scope.todoPriority})
     toAdd.$save()
     $scope.todos.push toAdd
     $scope.todoText = null
@@ -27,7 +27,7 @@ window.Reminders = ($scope, $resource) ->
 
   $scope.reminders = Reminder.query()
   $scope.addReminder = ->
-    toAdd = new Reminder({title: $scope.reminderText, remindAt: new Date().getTime()})
+    toAdd = new Reminder({id: 'new', title: $scope.reminderText, remindAt: new Date().getTime()})
     toAdd.$save()
     $scope.reminders.push toAdd
     $scope.reminderText = null
diff --git a/examples/sprest-reactivemongo-example/src/main/scala/DB.scala b/examples/sprest-reactivemongo-example/src/main/scala/DB.scala
index 0d73a40..9cfb3b6 100644
--- a/examples/sprest-reactivemongo-example/src/main/scala/DB.scala
+++ b/examples/sprest-reactivemongo-example/src/main/scala/DB.scala
@@ -8,7 +8,6 @@ import spray.json.RootJsonFormat
 object DB extends ReactiveMongoPersistence {
 
   import reactivemongo.api._
-  import sprest.models.UUIDStringId
   import sprest.models.UniqueSelector
   import models._
   import scala.concurrent.ExecutionContext
@@ -17,23 +16,27 @@ object DB extends ReactiveMongoPersistence {
   lazy val connection = driver.connection(List("localhost"))
   lazy val db = connection("reactive-example")(Main.system.dispatcher)
 
-  // Json mapping to / from BSON - in this case we want "_id" from BSON to be 
+  // Json mapping to / from BSON - in this case we want "_id" from BSON to be
   // mapped to "id" in JSON in all cases
   implicit object JsonTypeMapper extends SprayJsonTypeMapper with NormalizedIdTransformer
 
-  abstract class UnsecuredDAO[M <: sprest.models.Model[String]](collName: String)(implicit jsformat: RootJsonFormat[M]) extends CollectionDAO[M, String](db(collName)) {
+  abstract class UnsecuredDAO[M <: sprest.models.Model[String]](
+    collName: String)(withNewId: M => M)(
+    implicit
+      jsformat: RootJsonFormat[M]) extends CollectionDAO[M, String](db(collName)) {
 
     case class Selector(id: String) extends UniqueSelector[M, String]
 
     override def generateSelector(id: String) = Selector(id)
-    override protected def addImpl(m: M)(implicit ec: ExecutionContext) = doAdd(m)
+    override protected def addImpl(m: M)(implicit ec: ExecutionContext) = doAdd(withNewId(m))
     override protected def updateImpl(m: M)(implicit ec: ExecutionContext) = doUpdate(m)
     override def remove(selector: Selector)(implicit ec: ExecutionContext) = uncheckedRemoveById(selector.id)
   }
 
+  def newGuid = java.util.UUID.randomUUID.toString
+
   // MongoDB collections:
-  object ToDos extends UnsecuredDAO[ToDo]("todos") with UUIDStringId
-  object Reminders extends UnsecuredDAO[Reminder]("reminders") with UUIDStringId
+  object ToDos extends UnsecuredDAO[ToDo]("todos")(_.copy(id = newGuid))
+  object Reminders extends UnsecuredDAO[Reminder]("reminders")(_.copy(id = newGuid))
 
 }
-
diff --git a/examples/sprest-reactivemongo-example/src/main/scala/models/Reminder.scala b/examples/sprest-reactivemongo-example/src/main/scala/models/Reminder.scala
index e24a845..97124a9 100644
--- a/examples/sprest-reactivemongo-example/src/main/scala/models/Reminder.scala
+++ b/examples/sprest-reactivemongo-example/src/main/scala/models/Reminder.scala
@@ -1,18 +1,18 @@
 package sprest.examples.reactivemongo.models
 
 import spray.json._
+import spray.json.DefaultJsonProtocol._
 import sprest.models._
 import org.joda.time.DateTime
 import sprest.reactivemongo.typemappers._
 
 case class Reminder(
+  id: String,
   remindAt: DateTime,
   title: String,
-  body: Option[String] = None,
-  var id: Option[String] = None) extends Model[String]
+  body: Option[String] = None) extends Model[String]
 
-object Reminder extends ModelCompanion[Reminder, String] {
+object Reminder {
   import sprest.Formats._
   implicit val reminderJsonFormat = jsonFormat4(Reminder.apply _)
 }
-
diff --git a/examples/sprest-reactivemongo-example/src/main/scala/models/ToDo.scala b/examples/sprest-reactivemongo-example/src/main/scala/models/ToDo.scala
index a292c50..3e3ff6d 100644
--- a/examples/sprest-reactivemongo-example/src/main/scala/models/ToDo.scala
+++ b/examples/sprest-reactivemongo-example/src/main/scala/models/ToDo.scala
@@ -1,6 +1,7 @@
 package sprest.examples.reactivemongo.models
 
 import spray.json._
+import spray.json.DefaultJsonProtocol._
 import sprest.models._
 
 import sprest.util.enum._
@@ -24,11 +25,12 @@ object Priority extends EnumCompanion[Priority] {
     BackBurner)
 }
 
-case class ToDo(text: String, done: Boolean, var id: Option[String] = None, priority: Priority = Priority.Normal) extends Model[String]
-
-object ToDo extends ModelCompanion[ToDo, String] {
+case class ToDo(
+  id: String,
+  text: String,
+  done: Boolean,
+  priority: Priority = Priority.Normal) extends Model[String]
 
+object ToDo {
   implicit val toDoFormat = jsonFormat4(ToDo.apply _)
-
 }
-