Gatling Feeder Issue : No attribute name 'CSVFieldName' is defined issue - performance

Question

I am newbie for Gatling and trying to read some fields from CSV and use them in my gatling scenario but facing
No attribute name 'CSVFieldName' is defined
issue ;
some details:
Gatling Version : bundle-2.2.3
CSV Name : memId.csv
CSV contents :
memid
CKABC123
Scala File contents :
//Class Declaration
{
//some http configuration
val memId_feeder = csv("memId.csv").circular
val scn = scenario("Scn name").during( 10 seconds ) {
feed(memId_feeder)
exec(http("Req_01_Auth")
.post("/auth")
.check(status.is(200))
.headers(header_1)
.formParam("memberId","${memid}"))
}
setup(scn.inject(atOnceUsers(1)).protocols(httpConf))
}
Any help or clue to resolve this issue is really appreciable .
P.S. : There is no whitespaces in the input csv file .

Answer 1

Oh, I can feel your pain…
It's a while since I played with Gatling. As far I remember you have to provide a "chain" of actions in the scenario definition employing currying.
This all means: placing a dot before exec should make it.
val scn = scenario("Scn name").during( 10 seconds ) {
feed(memId_feeder)
.exec(http("Req_01_Auth")
.post("/auth")
.check(status.is(200))
.headers(header_1)
.formParam("memberId","${memid}"))
}

Answer 2

In my case applying dot implies error.
import com.shutterfly.loadtest.commerce.webcartorch.simulations.AbstractScenarioSimulation
import com.shutterfly.loadtest.siteServices.services.MyProjectsService
import com.shutterfly.loadtest.siteServices.util.{Configuration, HttpConfigs}
import io.gatling.core.Predef._
import com.shutterfly.loadtest.siteServices.services.MyProjectsService._
import io.gatling.http.config.HttpProtocolBuilder
class MetaDataApiSimulation extends Simulation {
def scenarioName = "MetaData Flow. Get All Projects"
def userCount = Configuration.getNumUsers(20)
def rampUpTime = Configuration.getRampUpTime(60)
def httpConf: HttpProtocolBuilder = HttpConfigs.newConfig(Configuration.siteServicesServer.hostname)
def getMetadata = exec(MyProjectsService.getAllProjectsForUser("${userId}"))
def dataFileName = "MetadataSimulationData.csv"
def Photobook_AddToCartDataFile="Photobook_AddToCartData.csv"
def Calendar_AddToCartDataFile="Calendar_AddToCartData.csv"
def dataFileName4="AddToCartData.csv"
def assertions = List(
details("First Assertion").responseTime.percentile3.lessThan(1000)
)
val scn = scenario(scenarioName).during(5) {
.exec().feed(csv(dataFileName).circular).exec(getMetadata)
}
setUp(scn.inject(rampUsers(userCount) over rampUpTime))
.protocols(httpConf)
.assertions(assertions)
}