CODEWITHSUNDEEP
scalaplayframework
cool breeze
cool breeze

Reputation: 4811

Trying to understand how you use the request in Actions

I want to understand how the request variable comes in scope when you do:

def test(): Action = {  request =>

}

Reference: https://github.com/playframework/playframework/blob/master/framework/src/play/src/main/scala/play/api/mvc/Action.scala

Could you also bring in other variables in scope? How does this work under the covers in Scala?

In a relation issue, I created my own custom Action and I was confused as to what type it really is?

I did something like the Authentication example:

class AuthenticatedRequest[A](val username: String, request: Request[A]) extends WrappedRequest[A](request)

object Authenticated extends ActionBuilder[AuthenticatedRequest] {
  def invokeBlock[A](request: Request[A], block: (AuthenticatedRequest[A]) => Future[SimpleResult]) = {
    request.session.get("username").map { username =>
      block(new AuthenticatedRequest(username, request))
    } getOrElse {
      Future.successful(Forbidden)
    }
  }
}

Reference: https://www.playframework.com/documentation/2.2.x/ScalaActionsComposition

In my controller I wanted to pass the 'request' as a parameter to a method, but I couldn't figure out what exact type it was. When I tried AuthenticatedRequest it said I have to pass in type parameters.

Upvotes: 0

Views: 50

Answers (1)

Adi
Adi

Reputation: 727

An Action is a function that takes a Request[A] object as argument and returns a Result, and thats the type of your test method. Consider a simple example

type StrLen = String => Int

/**
 * A function that returns another function from String to Int
 */
def test2(): StrLen = { someString => someString.length() }

OR

def test2(): StrLen = str: String => { /* body */
   str.length()
}

Upvotes: 1

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