public IActionResult Add(int id)
        {
            var apiaryNumber = this.apiaryService.GetApiaryNumberByApiaryId(id);
            var viewModel    = new AddApiaryHelperInputModel
            {
                ApiaryNumber = apiaryNumber,
                ApiaryId     = id,
            };

            return(this.View(viewModel));
        }
        public async Task <IActionResult> Add(int id, AddApiaryHelperInputModel viewModel)
        {
            var currentUser = await this.userManager.GetUserAsync(this.User);

            viewModel.ApiaryId     = id;
            viewModel.ApiaryNumber = this.apiaryService.GetApiaryNumberByApiaryId(id);

            if (!this.ModelState.IsValid)
            {
                return(this.View(viewModel));
            }

            if (currentUser.UserName == viewModel.UserName)
            {
                this.ModelState.AddModelError("UserName", "Не може да добавите себе си!");
                return(this.View(viewModel));
            }

            var user = await this.userManager.FindByNameAsync(viewModel.UserName);

            if (this.apiaryHelperService.IsApiaryHelper(user.Id, id))
            {
                this.ModelState.AddModelError("UserName", "Потребителят вече е помощник!");
                return(this.View(viewModel));
            }

            await this.apiaryHelperService.AddAsync(user.Id, id);

            var helper = await this.userManager.FindByNameAsync(viewModel.UserName);

            await this.emailSender.SendEmailAsync(
                this.configuration["SendGrid:RecipientEmail"],
                GlobalConstants.SystemName,
                currentUser.Email,
                "Успешно добавен помощник",
                $"Успешно добавихте <strong>{helper.UserName}</strong>, като помощник на пчелин: <strong>{viewModel.ApiaryNumber}</strong>.");

            await this.emailSender.SendEmailAsync(
                this.configuration["SendGrid:RecipientEmail"],
                GlobalConstants.SystemName,
                helper.Email,
                "Успешно добавен помощник",
                $"Успешно бяхте добавени, като помощник на пчелин: <strong>{viewModel.ApiaryNumber}</strong> от <strong>{currentUser.Email}</strong>.");

            this.TempData[GlobalConstants.SuccessMessage] = "Успешно добавен помощник!";
            return(this.RedirectToAction(nameof(this.All), new { id = viewModel.ApiaryId }));
        }