public void UpdateFromRapidCombination(CombinationConsumable5.ResultModel result,
long requiredIndex)
{
var mail = mailBox.First(m => m.id == result.id);
mail.requiredBlockIndex = requiredIndex;
var item = inventory.Items
.Select(i => i.item)
.OfType <ItemUsable>()
.First(i => i.ItemId == result.itemUsable.ItemId);
item.Update(requiredIndex);
}