//Show All checked out items by the selected school
 public ActionResult Index(int? id)
 {
     if (Session["isAdmin"] == null)
         return RedirectToAction("Index", new { controller = "Home", action = "Index" });
     if (id == null)
         return RedirectToAction("Index", new { Controller = "CheckOut", Action = "Index"});
     int result = (int)id;
     var school = db.Schools.Find(id);
     if (school == null)
     {
         TempData["error"] = "Cannot find selected school";
         return RedirectToAction("Index", new { Controller = "CheckOut", Action = "Index" });
     }
     var rentedItems = getRentedItems(result);
     if(rentedItems.Count == 0)
     {
         TempData["error"] = "Selected School does not have items to be checked in";
         return RedirectToAction("Index", new { Controller = "CheckOut", Action = "Index" });
     }
     IList<ItemTypes> rentedItemTypes = new List<ItemTypes>();
     IList<bool> rentedItemsTypesCheckboxes = new List<bool>();
     foreach (var item in rentedItems)
     {
         int index = rentedItemTypes.IndexOf(item.ItemType);
         if (index == -1)
         {
             rentedItemTypes.Add(item.ItemType);
             rentedItemsTypesCheckboxes.Add(false);
         }
     }
     CheckInItemTypeSelectViewModel vm = new CheckInItemTypeSelectViewModel
     {
         ItemTypesModel = rentedItemTypes.OrderBy(itemType => itemType.ItemName).ToList(),
         ItemTypesCheckboxes = rentedItemsTypesCheckboxes,
         SelectedSchoolId = result
     };
     return View(vm);
 }
 public ActionResult ItemTypesSubmit(CheckInItemTypeSelectViewModel vm)
 {
     if (Session["isAdmin"] == null)
         return RedirectToAction("Index", new { controller = "Home", action = "Index" });
     if (vm == null)
         return RedirectToAction("Index");
     int index = 0;
     IList<ItemTypes> selectedItemTypes = new List<ItemTypes>();
     IList<int> itemQuantities = new List<int>();
     foreach(bool isChecked in vm.ItemTypesCheckboxes)
     {
         if (isChecked)
         {
             var itemType = db.ItemTypes.Find(vm.ItemTypesModel[index].ItemTypeId);
             if (itemType == null)
                 return RedirectToAction("Index");
             selectedItemTypes.Add(itemType);
             var itemsRented = db.Items.Where(item => item.CheckedOutSchoolId == vm.SelectedSchoolId);
             itemsRented = itemsRented.Where(item => item.ItemTypeId == itemType.ItemTypeId);
             itemsRented = itemsRented.Where(item => item.CheckedInById == null);
             int numRented = itemsRented.ToList().Count;
             itemQuantities.Add(numRented);
         }
         index++;
     }
     CheckInQuantitySelectViewModel quantityVm = new CheckInQuantitySelectViewModel
     {
         SelectedItemTypesModel = selectedItemTypes,
         ItemQuantityFields = itemQuantities,
         SelectedSchoolId = vm.SelectedSchoolId
     };
     TempData["CheckInQuantitySelectViewModel"] = quantityVm;
     return RedirectToAction("QuantitySelect");
 }