How to loop through an array of strings Gatling during scenario building - scala

Question

I'm trying to loop through an array of products (Strings) in order to execute a call for each of them but I'm mismatching some types during scenario building, here is an example of what I'm trying to do:
val createAddToCart: ScenarioBuilder = scenario("Add to cart").exec(CartRequest.addToCart())
This is my CartRequest object:
def addToCart(): Unit (???) = {
for (product <- products) {
addToCart(product)
}
}
def addToCart(productId:String): ChainBuilder =
{
exec(http("addToCart")
.post(addToCartUrl)
.headers(authHeaders)
.body(generateRequestBodyForProduct(productId)).asJson
.check(bodyString.saveAs("body"))
).exec(
session => {
body = session("body").as[String]
println("response body " + body)
session
}
)
}
def generateRequestBodyForProduct(productId: String): Body with (Expression[String]) =
{
StringBody("{ \"productId\": \"" + productId + "\"," +
" \"qty\": " + 1 + " , " +
"\"storeId\": \"" + storeId + "\"}")
}
Obviously, I'm having problems calling CartRequest.addToCart() due to type mismatching (Unit to ChainBuilder).
Is there a way to execute and return the addToCart method as a list of scenarios?
I hope I explained myself well.
Thanks for your time.

Answer 1

First, you don't look like a Scala developper. You should probably use the new Java DSL available since Gatling 3.7.
Then, you're not using the Gatling constructs properly.
your for loop should be a Gatling foreach instead
the dynamic productId in your request body should be resolved with Gatling Expression Language => "{ \"productId\": \"#{productId}\", \"qty\": " + 1 + " , " + "\"storeId\": \"" + storeId + "\"}"