Mapping local JSON file to Realm object using Object Mapper - json

Question

I have local JSON file and i am trying to map that json to realm object using ObjectMapper_Realm library.
var totalLessonArray = [Lesson]()
if let path = Bundle.main.path(forResource: "data", ofType: "json") {
do {
let data = try Data(contentsOf: URL(fileURLWithPath: path), options: .mappedIfSafe)
let jsonResult = try JSONSerialization.jsonObject(with: data, options: [])
totalLessonArray = Mapper<Lesson>().mapArray(JSONArray: jsonResult as! [[String : Any]])
} catch {
// handle error
}
}
When i print totalLessonArray i get following error in my 4 level deep list
//...
quizScore = 0;
quizQuestions = List<Question> <0x6000022e4d80> (
[0] Question {
question = What are the synonym of sympathy? Drag and drop in the box below.;
answer = <Maximum depth exceeded>;
}
);
//...
This is the model file
class Lesson : Object, Mappable{
#objc dynamic var lessonNumber : Int = 0
#objc dynamic var totalChapter : Int = 0
#objc dynamic var completedChapter : Int = 0
#objc dynamic var quizTaken : Bool = false
#objc dynamic var isFinished : Bool = false
#objc dynamic var isCurrentlyWatchingLesson : Bool = false
#objc dynamic var currentlyWatchingChapter : Int = 0
#objc dynamic var lessonTitle : String = ""
#objc dynamic var quizScore : Int = 0
var chapter = List<Chapter>()
var quizQuestions = List<Question>()
required convenience init?(map: Map) {
self.init()
}
func mapping(map: Map) {
lessonNumber <- map["lessonNumber"]
totalChapter <- map["totalChapter"]
completedChapter <- map["completedChapter"]
quizTaken <- map["quizTaken"]
isFinished <- map["isFinished"]
isCurrentlyWatchingLesson <- map["isCurrentlyWatchingLesson"]
currentlyWatchingChapter <- map["currentlyWatchingChapter"]
lessonTitle <- map["lessonTitle"]
quizScore <- map["quizScore"]
chapter <- (map["chapter"], ListTransform<Chapter>())
quizQuestions <- (map["quizQuestions"], ListTransform<Question>())
}
}
I have json which is 4-5 level down deep. Am i doing something wrong?