Book Image

Building Applications with Scala

By : Diego Pacheco
Book Image

Building Applications with Scala

By: Diego Pacheco

Overview of this book

<p>Scala is known for incorporating both object-oriented and functional programming into a concise and extremely powerful package. However, creating an app in Scala can get a little tricky because of the complexity the language has. This book will help you dive straight into app development by creating a real, reactive, and functional application. We will provide you with practical examples and instructions using a hands-on approach that will give you a firm grounding in reactive functional principles.</p> <p>The book will take you through all the fundamentals of app development within Scala as you build an application piece by piece. We’ve made sure to incorporate everything you need from setting up to building reports and scaling architecture. This book also covers the most useful tools available in the Scala ecosystem, such as Slick, Play, and Akka, and a whole lot more. It will help you unlock the secrets of building your own up-to-date Scala application while maximizing performance and scalability.</p>
Table of Contents (17 chapters)
Building Applications with Scala
Credits
About the Author
Acknowledgments
About the Reviewer
www.PacktPub.com
Preface

Refactoring controllers


Now we have all the dao packages implemented with the respective database evolutions. However, our services expected a different contract, since we were using an in-memory database before. Let's refactor the product controller:

    package controllers 
    @Singleton 
    class ProductController @Inject() (val messagesApi:MessagesApi,val service:IProductService)  
    extends Controller with I18nSupport { 
      val productForm: Form[Product] = Form( 
        mapping( 
          "id" -> optional(longNumber), 
          "name" -> nonEmptyText, 
          "details" -> text, 
          "price" -> bigDecimal 
        )(models.Product.apply)(models.Product.unapply) 
      ) 
      def index = Action { implicit request => 
        val products = Awaits.get(5,service.findAll()) 
        .getOrElse(Seq())   
        Logger.info("index called. Products: " + products) 
        Ok(views.html.product_index(products)) 
      } 
      def blank = Action { implicit...