Concatenating lists in Groovy - json

Question

I have captured two sets of values by using JSON extractor in JMeter which I want to concatenate. Let me give you an example below for the format which I want to use.
The following are the two sets of captured values:
Set 1: [V2520 V2522 V2521 V2500 V2500]
Set 2: [PL PL PL NP NP]
So from the above sets, I am looking for the something like the following value, because the body which I have to send in a subsequent call contains the combination of these 2 values:
Answer: ["V2520PL", "V2522PL", "V2521PL", "V2500NP", "V2500NP"]
Can you please help me how to solve this in JMeter using Groovy?
This is the JSON I have:
{ "body": {
"responseObject": [
{
"benefitInfo": [
{
"procedureCode": "V2520",
"modifier": "PL",
"usage": "Dress",
"authorizationID": null,
"description": "ContactLensDisposable",
"id": "96",
"coPayAmount": "25"
},
{
"procedureCode": "V2522",
"modifier": "PL",
"usage": "Dress",
"authorizationID": null,
"description": "ContactLensDisposableBifocal",
"id": "98",
"coPayAmount": "25"
},
{
"procedureCode": "V2521",
"modifier": "PL",
"usage": "Dress",
"authorizationID": null,
"description": "ContactLensDisposableToric",
"id": "97",
"coPayAmount": "25"
},
{
"procedureCode": "V2500",
"modifier": "NP",
"usage": "Dress",
"authorizationID": null,
"description": "ContactLens (Non Plan)",
"id": "89",
"coPayAmount": "0"
},
{
"procedureCode": "V2500",
"modifier": "NP",
"usage": "Dress",
"authorizationID": null,
"description": "ContactLensConventional (Non Plan)",
"id": "157",
"coPayAmount": "0"
}
]
}
]}}

Answer 1

An easy way to do this is to combine them as you collect the values from the JSON when you parse it.
def json = new groovy.json.JsonSlurper().parseText(text)
def answer = json.body.responseObject[0].benefitInfo.collect { it.procedureCode + it.modifier }
assert answer == ["V2520PL", "V2522PL", "V2521PL", "V2500NP", "V2500NP"]

Answer 2

Another method would be to use transpose() and join():
def r = new groovy.json.JsonSlurper().parseText(text).body.responseObject.benefitInfo[0]
def answer = [r.procedureCode, r.modifier].transpose()*.join()
assert answer == ["V2520PL", "V2522PL", "V2521PL", "V2500NP", "V2500NP"]

Answer 3

Add JSR223 PostProcessor as a child of the request which returns the above JSON
Put the following code into "Script" area:
def answer = []
def benefitInfos = com.jayway.jsonpath.JsonPath.read(prev.getResponseDataAsString(), '$..benefitInfo')
benefitInfos.each { benefitInfo ->
benefitInfo.each { entry ->
answer.add(entry.get('procedureCode') + entry.get('modifier'))
}
}
vars.put('answer', new groovy.json.JsonBuilder(answer).toPrettyString())
That's it, you will be able to access generated value as ${answer} where required:
References:
Jayway JsonPath
Groovy: Parsing and producing JSON
Apache Groovy - Why and How You Should Use It