//Because wpf can't guess if just want to remove equipment from Warrior or delete completely from database
 private void EquipmentCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
 {
     if (_isLoading || _isWarriorListChanging)
     {
         return;
     }
     if (e.Action == NotifyCollectionChangedAction.Remove)
     {
         _repo.DeleteEquipment(e.OldItems);
         SetWarriorDirty();
     }
     if (e.Action == NotifyCollectionChangedAction.Add)
     {
         _currentWarrior.EquipmentOwned.AddRange(e.NewItems.Cast <WarriorEquipment>());
         SetWarriorDirty();
     }
 }