Flash doesn't show any message - scala

Question

I have a _flash subtemplate:
#(flash: Flash)
#flash.data.foreach { x =>
#x._1, #x._2
}
This code never shows any flash message. The code below doesn't work either
#if(!flash.isEmpty) {
#for((msgKey, msgValue) <- flash) {
<div class="alert alert-#msgKey" data-dismiss="alert">
<a title="#Messages("misc.message.close")" class="close">×</a>
#msgKey
</div>
}
}
due to the error at runtime: filter is not a member of Flash. And oddly enough, the code below does work and show a message:
#flash.get("success")
How I set the message is not important because it works well in the last case, however, there is the code for it:
if (success) {
Redirect(routes.Application.success).flashing("success" -> "Ok123")
} else {
Ok(views.html.registration.add(newForm))
}
My aim is loop over flash because it want to show all messages in _flash subtemplate.
UPDATE: I realized why the first approach doesn't work (I have to use map instead). But why does the second one raise the error at runtime?

Answer 1

Syntax error, you missed flash.data. From Play 2.0 API we see that Flash is a
case class Flash (data: Map[String, String]) extends Product with Serializable
So the correct code should be:
#if(!flash.isEmpty) {
#for((msgKey, msgValue) <- flash.data) {
<div class="alert alert-#msgKey" data-dismiss="alert">
<a title="#Messages("misc.message.close")" class="close">×</a>
#msgKey
</div>
}
}
I'm almost sure that this is compile-time error, you see it in runtime only because you use dev mode.
BTW, I usually do something like this:
#()(implicit flash: play.api.mvc.Flash)
#flash.get("success").map { message =>
<div class="alert alert-success alert-dismissable">
<button type="button" class="close" data-dismiss="alert" aria-hidden="true">×</button>
#message
</div>
}
#flash.get("failure").map { message =>
<div class="alert alert-danger alert-dismissable">
<a class="close" data-dismiss="alert">×</a>
#message
</div>
}