public static void UpdateTopic(TopicViewModel topic, ApplicationDbContext context = null)
{
var ContextInstance = context != null ? context : ApplicationDbContext.Create();
Topic update = GetTopic(topic.Id, ContextInstance);
if (topic.ParentId == -1)
{
update.Level = 0;
topic.ParentId = null;
}
else
{
Topic parent = GetTopic(topic.ParentId.Value, ContextInstance);
update.Level = parent.Level + 1;
update.ParentId = topic.ParentId;
}
update.Name = topic.Name;
if (topic.ChildIds != null)
{
update.Childs = topic.ChildIds.Select(x => ContextInstance.Topics.First(y => y.Id == x)).ToList();
}
ContextInstance.SaveChanges();
}
