/// <exception cref="InvalidModelException"/>
        /// <exception cref="NotFoundException"/>
        public async Task <Guid> AddAsync(Dtos.StructuralUnit dto)
        {
            var validator           = new Dtos.StructuralUnitValidator();
            ValidationResult result = validator.Validate(dto);

            if (!result.IsValid)
            {
                string errMess = string.Empty;

                foreach (var failure in result.Errors)
                {
                    errMess += $"Property { failure.PropertyName } failed validation. Error was: { failure.ErrorMessage }\n";
                }

                throw new InvalidModelException(errMess);
            }

            var id  = Guid.NewGuid();
            var now = DateTime.UtcNow;

            var structuralUnit = new Entities.StructuralUnit
            {
                Id          = id,
                CreatedAt   = now,
                UpdatedAt   = now,
                Chief       = dto.Chief,
                Code        = dto.Code,
                FullName    = dto.FullName,
                FullNameEng = dto.FullNameEng,
                ShortName   = dto.ShortName
            };

            await _context.AddAsync(structuralUnit);

            await _context.SaveChangesAsync();

            return(id);
        }
        /// <exception cref="InvalidModelException"/>
        /// <exception cref="NotFoundException"/>
        public async Task UpdateAsync(Dtos.StructuralUnit dto)
        {
            if (dto.Id.Equals(Guid.Empty))
            {
                throw new InvalidModelException("Property Id failed validation. Error was: Id is empty");
            }

            var validator           = new Dtos.StructuralUnitValidator();
            ValidationResult result = validator.Validate(dto);

            if (!result.IsValid)
            {
                string errMess = string.Empty;

                foreach (var failure in result.Errors)
                {
                    errMess += $"Property { failure.PropertyName } failed validation. Error was: { failure.ErrorMessage }\n";
                }

                throw new InvalidModelException(errMess);
            }

            var structuralUnit = await _context.FindAsync <Entities.StructuralUnit>(dto.Id);

            if (structuralUnit == null)
            {
                throw new NotFoundException($"Entity with id: {dto.Id} not found.");
            }

            structuralUnit.UpdatedAt   = DateTime.UtcNow;
            structuralUnit.Chief       = dto.Chief;
            structuralUnit.Code        = dto.Code;
            structuralUnit.FullName    = dto.FullName;
            structuralUnit.FullNameEng = dto.FullNameEng;
            structuralUnit.ShortName   = dto.ShortName;

            await _context.SaveChangesAsync();
        }