Scala Play 2, passing request to method

问题:

I have a Play 2.0 app

TestController.scala

def foo(p1: String) = Action {implicit request =>
  Ok(bar(p1))
}

private def bar(p1: String) = {
//access request parameter here
}

Is there a way to use implicit to pass request to bar

回答1:

Yes, you can:

  def foo(p1: String) = Action { implicit request =>
    Ok(bar(p1))
  }

  private def bar(p1: String)(implicit req: RequestHeader) = "content"

The code:

Action { implicit request

Calls this method on the Action object:

def apply(block: Request[AnyContent] => Result): Action[AnyContent] = {

So, what you called "request" matches the paramater named "block". The "implicit" here is optional: it makes the "request" value available as an implicit parameter to other method/function calls.

The implicit in your "bar" function says that it can take the value of "req" from an implicit value, and doesn't necessarily need to be passed in explicitly.