public Task CreateAsync(TimeOffPolicyApproverDTO ItemDTO)
        {
            TimeOffPolicyApproversDTOChecker(ItemDTO);

            var Item = mapper.Map <TimeOffPolicyApproverDTO, TimeOffPolicyApprover>(ItemDTO);

            var Comparer = new TimeOffPolicyApproverComparer();

            var template = unitOfWork.TimeOffPolicyApprovers.Find(x =>
                                                                  x.EmployeePositionId == Item.EmployeePositionId &&
                                                                  x.EmployeePositionTimeOffPolicyId == Item.EmployeePositionTimeOffPolicyId);

            if (template == null)
            {
                unitOfWork.TimeOffPolicyApprovers.Create(Item);
                return(unitOfWork.SaveAsync());
            }
            else if (Comparer.Equals(template, Item))
            {
                return(Task.CompletedTask);
            }
            else
            {
                throw new ArgumentException("Can not exist two Approvers with same Employee Position");
            }
        }
        public Task UpdateAsync(TimeOffPolicyApproverDTO ItemDTO)
        {
            TimeOffPolicyApproversDTOChecker(ItemDTO);

            var Item = mapper.Map <TimeOffPolicyApproverDTO, TimeOffPolicyApprover>(ItemDTO);

            var Comparer = new TimeOffPolicyApproverComparer();

            if (unitOfWork.TimeOffPolicyApprovers.Get(Item.Id) is TimeOffPolicyApprover oldItem)
            {
                if (Comparer.Equals(oldItem, Item))
                {
                    return(Task.CompletedTask);
                }
                if (oldItem.EmployeePositionId != Item.EmployeePositionId ||
                    oldItem.EmployeePositionTimeOffPolicyId != Item.EmployeePositionTimeOffPolicyId)
                {
                    return(CreateAsync(ItemDTO));
                }
            }
            unitOfWork.TimeOffPolicyApprovers.Update(Item);
            return(unitOfWork.SaveAsync());
        }