Adding a attribute to json file - json

Question

I have a json file of the format
{"latitude":28.488069,"longitude":-81.407208,"data":[{"time":1462680000,"summary":"Clear"},{"time":1462683600,"summary":"Clear",},{"time":1462694400,"summary":"Clear"}]}}
I want to add id attribute inside data
val result = jsonfile
val Jsonobject = Json.parse(result).as[JsObject]
val res = Jsonobject ++ Json.obj("id" -> 1234)
println(Json.prettyPrint(res))
the output should be
{"latitude":28.488069,"longitude":-81.407208,"data":[{"time":1462680000,"summary":"Clear","id":"1234"},{"time":1462683600,"summary":"Clear","id":"1235"},{"time":1462694400,"summary":"Clear","id":"1236"}]}
but my output is
{"latitude":28.488069,"longitude":-81.407208,"data":[{"time":1462680000,"summary":"Clear"},{"time":1462683600,"summary":"Clear",},{"time":1462694400,"summary":"Clear"}]},"id":"1234"}

Answer 1

There are a couple of things missing in your code. In your expected output, the ID is incremented, how do you expect to just add "id" -> 1234 and have it automatically incremented ?
Anyway, you have to loop through the elements in data and set it for each one of them. Something like this works:
val j = Json.parse(result).as[JsObject]
val res = j ++ Json.obj("data" ->
// get the 'data' array and loop inside
(j \ "data").as[JsArray].value.zipWithIndex.map {
// zipWithIndex lets us use the index to increment the ID
case (x,i) => x.as[JsObject] + ("id" , JsString((1234 + i).toString)) })
println(Json.prettyPrint(res))
{
"latitude" : 28.488069,
"longitude" : -81.407208,
"data" : [ {
"time" : 1462680000,
"summary" : "Clear",
"id" : "1234"
}, {
"time" : 1462683600,
"summary" : "Clear",
"id" : "1235"
}, {
"time" : 1462694400,
"summary" : "Clear",
"id" : "1236"
} ]
}