Groovy Collect values from nested json arrays - json

Question

I am trying to map a nested json into a flat file but have an issue referencing between different arrays.
I get it working for each array separately but can't figure out how to properly reference the parent ids to be included. I tried working with indexes and copying the event.id and event.lots.id on the pricings objects but that got really messy.
Maybe I am just on the wrong track or didn't have the right idea on how this might work.
Code
def body = message.getBody(String.class)
def jsonSlurper = new JsonSlurper()
def object = jsonSlurper.parseText(body)
def i_events = object.events
def i_lots = object.events.lots
def i_pricing = object.events.lots.pricings
def o_values = i_pricing.flatten().collect {"(" + "'" + i_events.collect{it.id}[0] + "'" + "," + "'" + i_lots.collect{it.id}[1] + "'" + "," + "'" + it.id + "'" + "," + "'" +it.name + "'" + ")" }.join(',')
//just using print for testing
println o_values
Result
('event_id1','[id A, id B]','p id1','TEST 1'),('event_id1','[id A, id B]','p id2','TEST 2')
Expected Result
('event_id1','id3','p id1','TEST 1'),('event_id1','id A','p id2','TEST 2')
Sample input
{
"events": [
{
"id": "event_id1",
"name": "Test Event 01",
"to": "2021-08-27T02:30:00.000Z",
"from": "2021-08-26T16:15:00.000Z",
"parkingTo": "2021-08-27T02:30:00.000Z",
"parkingFrom": "2021-08-26T14:15:00.000Z",
"landmarkId": "111",
"slug": "test-event1",
"live": true,
"lots": [
{
"id": "id1",
"name": "Lot 1",
"pricings": []
},
{
"id": "id2",
"name": "Lot 2",
"pricings": []
},
{
"id": "id3",
"name": "Lot3",
"pricings": [
{
"id": "p id1",
"name": "TEST 1"
}
]
}
]
},
{
"id": "event_id2",
"name": "Test Event 2",
"to": "2020-08-31T17:00:00.000Z",
"from": "2020-08-31T14:00:00.000Z",
"parkingTo": "2020-09-01T08:45:00.000Z",
"parkingFrom": "2020-08-31T12:45:00.000Z",
"landmarkId": "111",
"slug": "test-event2",
"live": true,
"lots": [
{
"id": "id A",
"name": "lot A",
"pricings": [
{
"id": "p id2",
"name": "TEST 2"
}
]
},
{
"id": "id B",
"name": "lot B",
"pricings": []
}
]
}
],
"meta": {
"total": 2,
"firstElement": 0,
"lastElement": 2
}
}

Answer 1

Something like this should work (it's hard to say, as your example input seems different to your expected output)
I added a quote method for if the values contain a ', you will need to think if you need this, and how you're going to escape things
def escape(String s) {
"'${s.replaceAll("'", "\\\\'")}'"
}
def output = new JsonSlurper().parseText(body).events.collectMany { event ->
event.lots.collectMany { lot ->
lot.pricings.collect { pricing ->
"(${escape(event.id)}, ${escape(lot.id)}, ${escape(pricing.id)}, ${escape(pricing.name)})"
}
}
}.join(',')