public IActionResult Edit(Salary model)
        {
            Salary salaryToUpdate = _salary.GetSalaryById(model.Id);

            if (ModelState.IsValid)
            {
                if (salaryToUpdate != null)
                {
                    salaryToUpdate.EmploymentId = model.EmploymentId;
                    salaryToUpdate.Date         = model.Date;
                    salaryToUpdate.Amount       = model.Amount;
                    salaryToUpdate.PayDay       = model.PayDay;
                    salaryToUpdate.Role         = model.Role;

                    _salary.UpdateSalary(salaryToUpdate);
                    return(RedirectToAction("Index"));
                }
            }
            return(View(model));
        }