How to update nested JSON array in scala - json

Question

I'm a newbie to scala/play and I've been trying to update (add a new id to) the query array in the sections[1] of the JSON but I've had no success traversing the JSON as I have little knowledge of transformers and how to use it.
"definitions": [
{
"sections": [
{
"priority": 1,
"content": {
"title": "Driver",
"links": [
{
"url": "https://blabla.com",
"text": "See all"
}
]
},
"SearchQuery": {
"options": {
"aggregate": true,
"size": 20,
},
"query": "{\"id\":{\"include\":[\"0wxZ4Nr2\", \"0wxZbNr2\", \"6WZOPMw1\"}}"
}
},
{
"priority": 2,
"content": {
"title": "Deliver",
"links": [
{
"url": "https://blabla.com",
"text": "See all"
}
]
},
"SearchQuery": {
"options": {
"aggregate": true,
"size": 20,
},
"query": "{\"id\":{\"include\":[\"2W12Q2wq\", \"Nwq09lW3\", \"QweNN2d9\"]}}"
}
}
]
}
Any suggestions on how I can achieve this. My goal is to put values inside the specific fields of JSON array. I am using play JSON library throughout my application?

Answer 1

As you noticed if you use PlayJSON you can use Json Transformers
Updating a field would work like this:
val queryUpdater = (__ \ "definitions" \ 1 \ "SearchQuery" \ "query").json.update(
of[JsString].map {
case JsString(value) =>
val newValue: String = ... // calculate new value
JsString(newValue)
}
)
json.transform(queryUpdater)
If you needed to update all queries it would be more like:
val updateQuery = (__ \ "SearchQuery" \ "query").json.update(
of[JsString].map {
case JsString(value) =>
val newValue: String = ... // calculate new value
JsString(newValue)
}
)
val updateQueries = (__ \ "definitions").json.update(
of[JsArray].map {
case JsArray(arr) =>
JsArray(arr.map(_.transform(updateQuery)))
}
)
json.transform(updateQueries)