Add new element to HashMap but not found when query - Kotlin - list

Question

I am trying to add new list element to HashMap based on key value and its value is nested list.
Here is class that I initialized:
private val portalDummyData = listOf(
Portal(
id = "p1", address = "Moringa", clientID = "c1", clientSecret = "cs1", agents = mutableListOf(
Agent(
"agent1", "agent", email, listOf(
"p1"
)
),
Agent(
"agent2", "agent2", email, listOf(
"p1", "p2"
)
)
)
)
)
private val portalHashMap = HashMap<String, Portal>()
init {
portalDummyData.forEach { portalHashMap[it.id] = it }
}
As you can see each value of portalHashMap I store as list and in that list contains another list. So, I want to add new list element to list that retains inside its parent list. But when I added new element and that element not found.
Here is code that I tried to add new list element:
override suspend fun addAgentToPortal(agent: Agent, id: String) {
val portal = portalHashMap[id]
if (portal != null) {
val agents = portal.agents
agents.toMutableList().add(agent)
print(agents.count())
} else {
throw NotFoundException("Portal not found")
}
}
I want to add new Agent model to that Portal model but when I println(agents.count()) but the value still remains the same as default.

Answer 1

Use mutable list instead of list. You can't add new element in List
Portal(
id = "p1", address = "Moringa", clientID = "c1", clientSecret = "cs1",
agents = mutableListOf(
Agent( "agent1", "agent", email, listOf("p1")),
Agent("agent2", "agent2", email, listOf("p1", "p2"))
)
)