public async Task <IActionResult> MergeCarts([FromBody] MergeCartModel model)
{
var settings = new JsonSerializerSettings();
settings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
var user = await _userManager.GetUserAsync(User);
//cannot transfer cart if there is no user
if (user == null)
{
return(RedirectToAction("Error", "Home"));
}
//getting the visitor id of the anonymous cart
CookieHelper helper = new CookieHelper(_accessor);
string oldVisitorId = helper.GetOldVisitorId();
var result = _orderService.TransformCart(oldVisitorId, user.Id, model.DeleteOld);
//the old cart has been transfered and deleted, deleting the old visitor id
helper.DeleteOldVisitorId();
return(Json(result, settings));
}