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

package controllers

import javax.inject.{Inject, Singleton}
import play.api.mvc._
import play.api.libs.json.Json
import com.example.services.TaskLibraryService
import util.IOHttp._
import com.typesafe.scalalogging.LazyLogging
import cats.effect.IO
import scala.concurrent.ExecutionContext
import util.Schedulers

@Singleton
class MonixHomeController @Inject() (
    taskLibraryService: TaskLibraryService,
    cc: ControllerComponents
)(schedulers: Schedulers, ec: ExecutionContext)
    extends AbstractController(cc)
    with LazyLogging {

  private implicit val defaultScheduler = schedulers.dbScheduler

  def authors(bookId: Long) = Action.asyncF {
    for {
      _ <- IO(logger.debug("Getting Authors"))
      authors <- taskLibraryService.getAuthorsForBook(bookId).to[IO]
      _ <- IO(logger.debug("Where am I now?"))
      _ <- IO.shift(ec)
      _ <- IO(logger.info("Got Authors"))
      res <- IO.pure(Ok(Json.toJson(authors)))
    } yield (res)
  }

}