public ActionResult Topics(int id)
{
Topic topic = _chapterService.GetTopicById(id);
TopicVM topicVM = Mapper.Map <Topic, TopicVM>(topic);
var res = JsonConvert.SerializeObject(topic, new JsonSerializerSettings
{
ContractResolver = new CamelCasePropertyNamesContractResolver(),
ReferenceLoopHandling = ReferenceLoopHandling.Ignore
});
return(Content(res, "application/json"));
}