Not able to use Gatling Feeder to generate random data

Gatling (Open-Source)
1

I wrote this simple test in Gatling

val createUser = http("create user")
  .post("form/submit")
  .body(StringBody(RequestBuilder.createRandomUser())).asJSON
  .check(status.is(200))

setUp(
  scn.inject(
     atOnceUsers(25),
     rampUsers(10) over (5 seconds),
     constantUsersPerSec(30) during(10 minutes)
  )
).protocols(httpConf)

I tested the createRandomUser method for more than 10000 calls and it always generated random users.

But this code when Run inside of Gatling, starts complaining duplicate users in just 10 seconds of run

What I suspect is that each user in Gatling calls my random method once, but THEN re-uses the same object.

I did some googling and found Feeders

http://gatling.io/docs/current/session/feeder/

val feeder = Iterator.continually(Map("user"  -> 
    (RequestBuilder. createRandomUser(emails))))

val createUser = http(“create user”) .post(“form/submit”) .body(StringBody(feed(feeder))).asJSON .check(status.is(200))

but this doesn’t work.

How can I make sure that everytime a request is made … my random data method is called.

Also posted this question here

https://stackoverflow.com/questions/45247478/gatling-not-able-to-use-my-random-data-generator

2

I am using Gatling SBT Plugin 2.2.0