Handling update failure in Play 2.5 and ReactiveMongo

Question

I have written simple rest API that will add music track data to mongodb.

I am able to write track successfully, however I would like to handle error case.

My code as below -

  def saveTrack = Action.async(parse.json) { 
     import model.Track.trackFormat
     implicit request =>
    request.body.validate[Track].map { data =>
      trackService.save(data).onComplete {
        case Success(value) => Ok(Json.obj("message" -> Messages("track.save.ack")))
        case Failure(e) => Ok(Json.obj("message" -> Messages("track.save.nack")))
    }
    }
    Future.successful(Ok(Json.obj("message" -> Messages("track.save.fin"))))
  }

Lets suppose there is some failure happen in trackService.save(data) then I want to return error code. I am wondering how to achieve that.

Thanks Pari

Answer 1

def saveTrack = Action.async(parse.json) { implicit request =>
    request
      .body
      .validate[Track]
      .map { data =>
        trackService.save(data).map { v =>
          Ok(Json.toJson(Json.obj("message" -> Messages("ack"))))
        }.recover {
          case _ =>
            Ok(Json.toJson(Json.obj("message" -> Messages("nack"))))
        }
      }.getOrElse {Future.successful(BadRequest(Json.obj("error" -> "bad json")))
    }
  }

Use recover to handle errors and getOrElse in case the json body is not matching your model.