Collecting Elements in a JSON Array

Question

I having big toruble with Argonaut. I am needing to collect all elements in JSON array. For example, I having this data in JSON.

val data = """{"id": 1, "items": [{"name": "foo","price": 10},{"name": "bar","price": 20}]}"""

Then I am needing to collect all name values into List. So I am getting this

List("foo", "bar")

This is meaning that I am needing to traverse array so I am choosing Argonaut library to do this. But is very difficult to know how API is working in Argonaut. So far I have this,

val data = """{"id": 1, "items": [{"name": "foo","price": 10},{"name": "bar","price": 20}]}""".parseOption

data flatMap (k =>
  +k --\ "items" flatMap (_.downArray) map (- _)
  )

But I am not sure how to get values. Please I am needing advices here.

score 4 · Accepted Answer · 2019-04-26T22:36:50.077

If you add argonaut-monocle you can do this easily as follows:

import argonaut._
import Argonaut._
import argonaut.JsonPath._

scala> val json: Option[Json] = """{"id": 1, "items": [{"name": "foo","price": 10},{"name": "bar","price": 20}]}""".parseOption
json: Option[argonaut.Json] = Some({"id":1,"items":[{"name":"foo","price":10},{"name":"bar","price":20}]})

scala> root.items.each.name.string.getAll(json.get)
res1: List[String] = List(foo, bar)

Collecting Elements in a JSON Array

1 Answers1