I'm trying to parse following Json with Argonaut scala library:
{"took":5,"timed_out":false,"_shards":{"total":5,"successful":5,"failed":0},"hit
s":{"total":1285,"max_score":0.99627554,"hits":[{"_index":"logstash-2017.03.15",...
Parse.parseWith(posts, .field("took").flatMap(.string).getOrElse("42"), msg => msg) work fine to get the "took" field.
Now, I can't come up with a way to access nested values like hits->total. Another question, while we're at it would be how do I access list elements by index, like hits -> hits -> element 0 -> _index to get logstash-2017.03.15 in my case.
To get information out of the nested object you would have to drill down on the function being passed down (The functional way). By that I mean .map(.getField().map(.getField().map)) - You are going deeper and deeper within that field.
You will also notice that the toInt types return a option thus we are using a flatMap
import argonaut._, Argonaut._
val posts: String = """{
| "took":5,
| "timed_out":false,
| "_shards":{
| "total":5,
| "successful":5,
| "failed":0
| },
| "hits":{
| "total":1285,
| "max_score":0.99627554,
| "hits":[
| {
| "_index":"logstash-2017.03.15"
| }
| ]
| }
|}""".stripMargin
val took = Parse.parseWith(posts, _.field("took").flatMap(_.number.flatMap(_.toInt)).getOrElse(0), msg => 0)
val hitsTotal = Parse.parseWith(posts, _.field("hits").flatMap(
_.field("total").flatMap(_.number.flatMap(_.toInt))
).getOrElse(0), msg => 0)
val hitsList = Parse.parseWith[List[Json]](posts, _.field("hits").flatMap(_.field("hits").flatMap(_.array)).getOrElse(List()), msg => List())
Result:
took: Int = 5
hitsTotal: Int = 1285
hitsList: List[argonaut.Json] = List({"_index":"logstash-2017.03.15"})
You will notice that hitsList is just a normal List containing more JSON that you can use .field() on