public async Task <IActionResult> Edit(Unit unit)
        {
            if (ModelState.IsValid)
            {
                try
                {
                    if (!await _unitsService.UnitExists(unit.Id))
                    {
                        return(NotFound());
                    }

                    await _unitsService.Update(unit);
                }
                catch (DbUpdateConcurrencyException)
                {
                    if (!await _unitsService.UnitExists(unit.Id))
                    {
                        return(NotFound());
                    }
                    else
                    {
                        throw;
                    }
                }
                return(RedirectToAction(nameof(Index)));
            }
            return(View(unit));
        }