Use Int as a parameter for Kotlin data class - kotlin

Question

got a bit of a problem with creating a data class. First post, and a bit of a noob - be gentle :)
I'm trying to create a Kotlin data class to handle some responses from an API we use; the response of which looks a bit like this:
"data": {
"devices": {
"600": [
{
"device_id": "[deviceId]", ...
What I'm having trouble with is the "600" bit - I can't find a way to create the data class with this as a parameter. Each time I declare the var/val - it's throwing an error, but doesn't provide any helpful options in the IDE. All the rest are strings, so "devices" becomes "val devices: String" and so on. But in this case the val is an Int, and I don't know how to declare this in the data class.
I want to have the API response re-worked to something more easily defined, but that'll take time. Can anyone tell me how I can pass the Int as the parameter?
This is the data class:
data class SimRetrieveDevicesResponse(
val data: Devices,
val error: String? = null,
)
data class Devices(
val 600: List<DeviceInfo>? = null
)
data class DeviceInfo(
val device_id: String,
val device_type: String,
val network_id: String,
val send_period_sec: Int,
val loss_in_thousand: Int,
val tti_application_id: String,
val cmt_tenant_id: String,
)
Sorry I've called anything the wrong name...

Answer 1

Backtick-ing the val has fixed the error, and helped tremendously.

Answer 2

As stated in the comments, the mapping is more than likely for a map, so having a property called "600", back-ticked or not, is incorrect. As soon as you have another value like "700", you'd have to change your code.
Here's a working solution, based on the assumption from your JSON snippet that devices is a map of a list of device information:
import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
import io.kotest.assertions.withClue
import io.kotest.matchers.shouldBe
import io.kotest.matchers.shouldNotBe
import org.junit.jupiter.api.Test
data class SimRetrieveDevicesResponse(
val data: Devices,
val error: String? = null,
)
data class Devices(val devices: Map<String, List<DeviceInfo>>)
data class DeviceInfo(
val device_id: String,
val device_type: String,
val network_id: String,
val send_period_sec: Int,
val loss_in_thousand: Int,
val tti_application_id: String,
val cmt_tenant_id: String,
)
class StackOverFlowTest {
#Test
fun test() {
val data = """
{
"data": {
"devices": {
"600": [
{
"device_id": "device_id",
"device_type": "device_type",
"network_id": "network_id",
"send_period_sec": 2,
"loss_in_thousand": 3,
"tti_application_id": "tti_application_id",
"cmt_tenant_id": "cmt_tenant_id"
}
]
}
}
}
""".trimIndent()
val mapper = jacksonObjectMapper()
val response = mapper.readValue(data, SimRetrieveDevicesResponse::class.java)
val device = response.data.devices["600"]
withClue("Device should be present") {
device.shouldNotBe(null)
}
device!!.first().device_id shouldBe "device_id"
}
}
The assertions here use kotest, which you can add via this in your build.gradle.kts
testImplementation("io.kotest:kotest-assertions-core:$kotestVersion")