Question

I just started messing around with Play 2. I recently learned how to create a model (User) and how to show it in the view (please let me know if there’s any bad practice):

models/User.scala:

package models

case class User(id: Long, name: String)

object User {
  var user = User(
    id = 1L,
    name = "Mark"
  )

  def greeting = TODO

}

controllers/Application.scala:

package controllers

import play.api._
import play.api.mvc._
import models.User

object Application extends Controller {

  def index = Action {
    Ok(views.html.index("Your new application is ready."))
  }

  def hello =  Action {
    Ok(views.html.hello(User.user))
  }

}

hello.scala.html:

@(user: User)

@main("Welcome to Play 2.0") {

  <h2>@user.id</h2>
  <h3>@user.name</h3>

}

Now, I want to display the output of a function in the view.

How to accomplish that?

Answer 1

Let’s use another view (tag) which as you probably know is also just a Scala function:

/app/views/tags/userName.scala.html

@(user: User)
My Name is @user.name

So you can use the userName function in your index view

@(user: User)

@main("Welcome to Play 2.0") {

    <h2>@user.id</h2>
    <h3>User @user.name said: @tags.userName(user)</h3>

}

De facto the same you can also use functions from your models and controllers by just specyfying it as:

@SomeController.someFunction(user)
@SomeModel.someFunction(user)

And if your class isn’t placed in controllers or models packages (which are imported into the views by default) you just need to use full qualified path:

@utils.MyDateFormaters.formatDay(user.birthDay)