Replacement elfilebody with stringbody - template format

[selva4]

HI team
good morning!!

i am using CSV file feeder which will have the following values

payload

{"accountIds": ["#{accountid}"], "refreshCache": true}

and then passing session variable => payload into stringBody

StringBody(" #{payload}")

i know that it will pass only the payload resides in csv like the below format

body:StringChunksRequestBody{contentType=‘null’, charset=UTF-8, content={“accountIds”: [“#{accountid}”]}

session variable does not replace - #{accountid}

i am looking to find the solution - how to tell the elcompiler to replace it - #{accountid} with stringbody

Note: we know that elfilebody works very well, but we want go with stringbody

[selva4]

tried the below code as mentioned in the document

  object Templates {
    val template: Expression[String] = session =>  session("payload").as[String]
  }

.body(StringBody( Templates.template))

but still getting the same value

body:StringRequestBody{contentType=‘null’, charset=UTF-8, content={“accountIds”: [“#{accountid}”]}

session variables accountid not replaced

[slandelle]

This won’t work out of the box.
Gatling only parses Strings parameters into functions at some specific places so it only happens once when the Simulation is instantiated and doesn’t harm performance during the load test.