Post objects array to server

[Andrey Serdyuk]

Hello. I'm trying to post a JSON array of objects to a server. I'm pretty sure that server side works perfectly because I'm interacting with it using android app I have created. I'd be very appreciate if you could help to solve the problem I have with creating the same app on iOS using swift+swithttp.

Here is the method I'm parsing an object to array[string: any].

public func toDictionary() -> [String: Any] {
    var itemDic = [String: Any]()
    
    itemDic["UserId"] = UserId
    itemDic["SelectedItems"] = getSelectedItems()
    
    return itemDic
}

private func getSelectedItems() -> [[String: Any]] {
    var array = [[String: Any]]()
    
    for item in getSelectedItems {
        array.append(item.toDictionary())
    }

    return array
}

When I print toDictionary() result I can see in console the following output:
["UserId": 110021, "SelectedItems": [["AnswerId": 2, "ItemId": 1], ["AnswerId": 2, "ItemId": 4], ["AnswerId": 2, "ItemId": 7]]]

Here is the code how I post the object to the server
HTTP.POST(ServerApi.REPORT, parameters: model.toDictionary()) { response in
//process response
}

The UserId parameter is receiving but the SelectedItems always empty. Can you help me to undestend why this is happen and how can I fix it?

Thank you!!