flash not found in Products.scala - scala

Question

I am currently reading 'Play for Scala' by Peter Hilton. I have just got the the end of the first example Play app where you build a paperclip directory.
However upon compiling I get a compilation error telling me that the value 'flash' has not been found. Usually this is a simple mistake I have made but given that I am just following the guide in the book I can't identify a fix.
The error is in lines 52 and 53 in the 'NewProduct' function
Here is the code:
package controllers
import play.api.mvc.{Action, Controller}
import models.Product
import play.api.data.Form
import play.api.data.Forms.{mapping, longNumber, nonEmptyText}
import play.api.i18n.Messages
import play.api.mvc.Flash
object Products extends Controller {
private val productForm: Form[Product] = Form(
mapping(
"ean" -> longNumber.verifying(
"validation.ean.duplicate", Product.findByEan(_).isEmpty),
"name" -> nonEmptyText,
"description" -> nonEmptyText
)(Product.apply)(Product.unapply)
)
def list = Action {implicit request =>
val products = Product.findAll
Ok(views.html.products.list(products))
}
def show(ean: Long) = Action {implicit request =>
Product.findByEan(ean).map {product =>
Ok(views.html.products.details(product))
}.getOrElse(NotFound)
}
def save = Action { implicit request =>
val newProductForm = productForm.bindFromRequest()
newProductForm.fold(
hasErrors = {form =>
Redirect(routes.Products.newProduct()).
flashing(Flash(form.data) + ("error" -> Messages("validation.errors")))
},
success = {newProduct =>
Product.add(newProduct)
val message = Messages("products.new.success", newProduct.name)
Redirect(routes.Products.show(newProduct.ean)).
flashing("success" -> message)
}
)
}
def newProduct = Action { implicit request =>
val form = if(flash.get("error").isDefined)
productForm.bind(flash.data)
else
productForm
Ok(views.html.products.editProduct(form))
}
}

Answer 1

Example is working with Play < 2.3, you may want to check which version you are currently using. With Play > 2.3, request.flash must be used instead. In both case you can use request.flash (which is more explicit).