Play 2.0 Scala + MongoDB via Salat

Controller.scala

package controllers

import play.api._
import play.api.mvc._

import com.novus.salat._
import com.novus.salat.global._
import com.novus.salat.dao._

import util._

import com.mongodb.casbah.Imports._

case class Book(_id: ObjectId, author: Seq[String], isbn: String,
                price: Price, publicationYear: Option[Int], tags: Seq[String],
                title: String, publisher: Option[String], edition: Option[String]) 



case class Price(currency: String, discount: Double, msrp: Double) 

object BookDAO extends SalatDAO[Book, ObjectId](collection = MongoConnection()("playbookstore")("books"))


object Application extends Controller {
  
  // Straight up use of grater
  def index = Action {
    val mongo = MongoConnection()("playbookstore")("books")
    val books = mongo.find()
    Ok(views.html.index(books.map(book => grater[Book].asObject(book)).toSeq))
  }

  // Use Salat DAO instead, with same template code
  def dao = Action {
    val mongo = MongoConnection()("playbookstore")("books")
    val books = mongo.find()
    Ok(views.html.index(BookDAO.find(MongoDBObject.empty).toSeq))
  }
  
}

index.scala.html

@(books: Iterable[controllers.Book])

<ul>
@books.map { book => 
<li>@book.title by @book.author.mkString(", ")</li>
}
</ul>

routes

# Routes
# This file defines all application routes (Higher priority routes first)
# ~~~~

# Home page
GET     /                           controllers.Application.index()

GET    /dao                         controllers.Application.dao()

# Map static resources from the /public folder to the /assets URL path
GET     /assets/*file               controllers.Assets.at(path="/public", file)

sample_book.json

{
	"_id" : ObjectId("4d2a6084c6237b412fcd5597"),
	"author" : [
		"Brian P. Hogan"
	],
	"isbn" : "978-1-93435-668-5",
	"price" : {
		"currency" : "USD",
		"discount" : 21.78,
		"msrp" : 33
	},
	"publicationYear" : 2010,
	"tags" : [
		"html5",
		"cascading style sheets",
		"css",
		"html",
		"pragmatic programmer",
		"silverlight",
		"web development",
		"web standards",
		"css3",
		"foo"
	],
	"title" : "HTML5 and CSS3"
}

Is there a reason you specify Casbah explicitly?