Play Framework 2.6 Mongo Scala Driver Official Json Format Macro for ObjectId

ObjectIdFormatJsonMacro.scala

import org.mongodb.scala.bson.ObjectId
import play.api.libs.json._
import scala.util.Try

object ObjectIdFormatJsonMacro extends Format[ObjectId] {

  def writes(objectId: ObjectId): JsValue = JsString(objectId.toString)
  def reads(json: JsValue): JsResult[ObjectId] = json match {
    case JsString(x) => {
      val maybeOID: Try[ObjectId] = Try{new ObjectId(x)}
      if(maybeOID.isSuccess) JsSuccess(maybeOID.get) else {
        JsError("Expected ObjectId as JsString")
      }
    }
    case _ => JsError("Expected ObjectId as JsString")
  }
}

Use it like this in your business object:

case class BusinessTime(_id: ObjectId = new ObjectId(), payRate: Double)

object BusinessTime {
implicit val objectIdFormat = ObjectIdFormatJsonMacro
implicit val businessTimeFormat = Json.format[BusinessTime]
}

RIP ReactiveMongo, codecs ftw