playframework 2.1 - Transform _id to id with JSON format macro -

i use reactivemongo in play application. models use property id , not _id. how can automatically transform object id(_id), mapped id property of models.

currently write format hand:

implicit val adviceformat = (   (__ \ '_id).format[bsonobjectid] ,   (__ \ 'lang).format[lang] ,   (__ \ 'title).format[string] ,   (__ \ 'text).format[string] ,   (__ \ 'reads).formatnullable[seq[periodcounter]] ,   (__ \ 'creationdate).format[datetime] ,   (__ \ 'updatedate).format[datetime] )(advice.apply, unlift(advice.unapply)) 

but write only:

implicit val adviceformat = json.format[advice] 

update:

based on answer of trevor.reznik have figured out.

implicit val advicejsonreads = __.json.update((__ \ 'id).json.copyfrom((__ \ '_id).json.pick[jsobject] )) andthen json.reads[advice] implicit val advicejsonwrites = json.writes[advice].transform( js => js.as[jsobject] - "id"  ++ json.obj("_id" -> js \ "id") ) 

for json writes can :

val userwrites = json.writes[user].transform( js => js.as[jsobject] - "id"  ++ json.obj("_id" -> js \ "id") ) 

but i'm not sure can similar reads.