# Storing a random json return value
**URL:** https://community.gatling.io/t/storing-a-random-json-return-value/508
**Category:** Gatling (Open-Source)
**Created:** [July 26, 2013, 1:23pm UTC](https://community.gatling.io/t/storing-a-random-json-return-value/508 "2013-07-26T13:23:16Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Roy\_van\_der\_Valk](https://community.gatling.io/u/Roy_van_der_Valk)
#### Post date: [July 26, 2013, 1:23pm UTC](https://community.gatling.io/t/storing-a-random-json-return-value/508/1 "2013-07-26T13:23:16Z")
Dear all,
I one of my previous question I asked how I could build a generic function that knows how to manipulate the default requests outputted by the recorder. I’ve build this as suggested by Stéphane by making a generic http function. Simplified it looks as follows.
> def httpInterpreted(name: String, url: EvaluatableString, headers: Map[String,String], requestBodyFile: String) =
> {
> def defaultHttp …
> def customHttp …
> …
> requestType match
> {
> case “instantiate” =\> customHttp(List(“objecttype”))
> .check(jsonPath(“$…guid”).saveAs(“guid”))
> case “retrieve\_by\_xpath”=\> customHttp(List(“xpath”, “schema”, “count”, “aggregates”))
> .check(jsonPath(“$…mxobjects.guid”).find( **?random?** ).whatever.saveAs(“guid”))
> …
> case \_ =\> defaultHttp
> }
> }
I want to store one random guid of all the ones returned. I know how to do [this](https://github.com/excilys/gatling/wiki/Session#building-session-functions-) in this way, by building a session function, but than I have to do it for every request. I think it would be need to also use some generic solution for this.
I tried passing the session to this function and retrieving the session member and editing it, but it didn’t work. My guess is the session members (in this case ${guid}), aren’t accessible only after the whole http method is executed or am I wrong?
Do you have any idea for solving this issue?
Cheers,
Roy
---
### Author:  [@Excilys](https://community.gatling.io/u/Excilys)
#### Post date: [July 26, 2013, 1:33pm UTC](https://community.gatling.io/t/storing-a-random-json-return-value/508/2 "2013-07-26T13:33:41Z")
Why don’t you findAll of them, and pick one randomly in a transform step directly into your check? [https://github.com/excilys/gatling/wiki/Checks#wiki-transforming](https://github.com/excilys/gatling/wiki/Checks#wiki-transforming)
---
### Author:  [@Roy\_van\_der\_Valk](https://community.gatling.io/u/Roy_van_der_Valk)
#### Post date: [July 26, 2013, 1:47pm UTC](https://community.gatling.io/t/storing-a-random-json-return-value/508/3 "2013-07-26T13:47:58Z")
Didn’t know about this functionality. Great! Have a nice weekend!
---
### Author:  [@Excilys](https://community.gatling.io/u/Excilys)
#### Post date: [July 26, 2013, 1:48pm UTC](https://community.gatling.io/t/storing-a-random-json-return-value/508/4 "2013-07-26T13:48:56Z")
You’re welcome. You too!