Mongodb Document to Scala case class

Question

I am using MongoDB scala driver. I have a problem with fetching record from MongoDB. Following is my MongoDB initialization

private val client: MongoClient          


        

Answer 1

You could use a JSON library.

In play-json

case class WorkOrder (
  id: String,
  workOrderId: String,
  thingId: String,
  alertId: String,
  description: String,
  lastViewedDate: Date,
  suggestedMaintenanceDate: Date,
  startDate: Date
)

object WorkOrder {
  implicit lazy val fmt = Json.format[WorkOrder]
}

def documentToWorkOrder(doc: Document): WorkOrder = {
  Json.parse(user.toJson().toString).validate[WorkOrder] match {
    case JsSuccess(_, workOrderObj) => workOrderObj
    case JsError(throwable)  => throw throwable
  }
}

//then in your code
MongoFactory.WorkOrdercollection.find(query).subscribe(
 (user: Document) => documentToWorkOrder(user),
 (error: Throwable) => println(s"Query failed: ${error.getMessage}"),
 () => println("Done")
)

Answer 2

You need to provide a custom codec for $date field. The following shows how it is done in play-json but the concept is similar in other JSON libraries:

object WorkOrder {
  implicit val dateRead: Reads[Date] =
    (__ \ "$date").read[Long].map(date => new Date(date))

  implicit val dateWrite: Writes[Date] = new Writes[Date] {
    def writes(date: Date): JsValue = Json.obj("$date" -> date.getTime)
  }

  implicit val codec = Json.format[WorkOrder]
}