json - Scala + Reactivemongo: Controling custom readers/writers for REST-API -

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i working on rest-api implemented in scalatra , using reactivemongo. persistent model implemented using case classes , thin repository layer uses common approach bson<->class mapping via documentreader/documentwriter (via implicit converters in case class companion object).

case class address(street: string, number: string, city: string, zip: string) object address{  implicit val addresshandler = macros.handler[address] implicit val addressfmt = json.format[address] }

the first formatter maps bson case classes second converts json (the output format of rest-api).

this fine , quite happy how nicely integrates.

in many cases though, don't need operate on domain objects (case class instances) , want stream data coming data base write http response. intermediate conversions overhead in scenarios. want control fields exposed (i once used yoga , jackson in java project).

possible solutions to:

  • have generic repository converts map structure intermediate format.
  • control implicit converters available driver on per-query basis , write case classes different "views"
  • use bsondocument intermediate format , make rest layer understand bson via bson=>string conversion.

i wonder best approach , if has experience particular scenario. maybe missing out option? feedback welcome.

to control fields exposed, have write readers , writers. below example extracted project https://github.com/luongbalinh/play-mongo.

import java.time.zoneddatetime  case class user(override val id: option[long] = none,             firstname: string,             lastname: string,             age: int,             active: boolean,             createddate: option[zoneddatetime] = none,             updateddate: option[zoneddatetime] = none              ) extends idmodel[user] {   override def withnewid(id: long): user = this.copy(id = some(id)) }  object user {  import play.api.libs.functional.syntax._ import play.api.libs.json._  implicit val userreads: reads[user] = ( (jspath \ "id").readnullable[long] ,   (jspath \ "firstname").read[string] ,   (jspath \ "lastname").read[string] ,   (jspath \ "age").read[int] ,   (jspath \ "active").read[boolean] ,   (jspath \ "createddate").readnullable[zoneddatetime] ,   (jspath \ "updateddate").readnullable[zoneddatetime] )(user.apply _)  implicit val userwrites: writes[user] = ( (jspath \ "id").writenullable[long] ,   (jspath \ "firstname").write[string] ,   (jspath \ "lastname").write[string] ,   (jspath \ "age").write[int] ,   (jspath \ "active").write[boolean] ,   (jspath \ "createddate").writenullable[zoneddatetime] ,   (jspath \ "updateddate").writenullable[zoneddatetime] )(unlift(user.unapply)) }

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