Scala-Play-Slick-Demo/app/controllers/HomeController.scala

package controllers

import javax.inject.{Inject, Singleton}

import com.example.user.UserDAO
import play.api.mvc._

import scala.concurrent.ExecutionContext
import com.example.user.CarDAO
import com.example.services.LibraryService
import play.api.libs.json.Json
import com.example.services.TaskLibraryService

case class UserForm(name: String)
object UserForm {
  implicit val userFormFormat = Json.format[UserForm]
}

@Singleton
class HomeController @Inject() (
    userDAO: UserDAO,
    carDAO: CarDAO,
    libraryService: LibraryService,
    taskLibraryService: TaskLibraryService,
    cc: ControllerComponents
)(implicit ec: ExecutionContext)
    extends AbstractController(cc) {

  def index = Action.async {
    userDAO.all.map { users => Ok(views.html.index(users)) }
  }

  def cars = Action.async {
    carDAO.all.map { cars => Ok(views.html.cars(cars)) }
  }

  def book = Action.async {
    // libraryService.findBookById(1).map(e => Ok(Json.toJson(e)))
    // libraryService.insertBookAndAuthor(Book("new book"), Author(2, "Some retard"))

    for {
      maybeBook <- libraryService.findBookById(1)
    } yield (Ok(Json.toJson(maybeBook)))
  }

  def authors(bookId: Long) = Action.async {
    libraryService
      .getAuthorsForBook(bookId)
      .map(t => {
        Ok(Json.toJson(t))
      })
  }

  def user = Action {
    Ok(Json.toJson(UserForm("hello")))
  }

}