playframework 2.0 - Play Framework Json Transform recursivly -

since while fooling around following problem.

i try recursivly transform through tree-like json structure.

{     "id": 21,     "title": "title1",     "children": [         {             "id": 22,             "title": "title1.1",             "children": [                 {                     "id": 33,                     "title": "title1.1.1",                     "children": [                         {                             "id": 41,                             "title": "title1.1.1.1",                             "children": [                                 {                                     "id": 42,                                     "title": "title1.1.1.1.1",                                 }                             ]                         }                     ]                 }             ]         }     ] } 

so far have :

  val idchanger:reads[jsobject] = (__ \ 'id).json.update(of[jsnumber].map{case jsnumber(nb) => jsnumber(nb * 100)})    val childpicker:reads[jsvalue] = (__ \ 'children).json.pick[jsarray].map{     case jsarray(arr) => jsarray(arr.map(o => {       o.transform(idchanger) match {         case jssuccess(value, jspath) =>           println(s"success:$value")           value         case jserror(errors) =>           println(s"error:$errors"); jsnull       }     }))   }  val jsvalue: jsvalue = ... jsvalue.transform(childpicker) ... 

this works on first level , changes id '21' accordingly, not rest far.

i tried many different ways rest of children recursivly too, no success far.

any on 1 appreciated.

cheers, rob.

just add recursive call inside reads , make sure handle jsarray jsobject. here simple example fits basic idea.

val idchanger: reads[jsobject] =   (__ \ 'id).json.update(of[jsnumber].map{case jsnumber(nb) => jsnumber(nb * 100)})   val picker: reads[jsvalue] = __.json.pick.map{   case jsarray(arr) => jsarray(arr.map(_.transform(picker).get))   case v: jsvalue =>     v.transform(       idchanger andthen (__ \ "children").json.update(picker) orelse       idchanger   ).get }