parr_api/PARR.API/Validators/GeneratorTemplateRequestValidator.cs

using FluentValidation;
using PARR.API.Contracts.V1.Requests;
using PARR.BLL.Contracts;
using PARR.DAL.Services.Interfaces;

namespace PARR.API.Validators
{
    public class GeneratorTemplateRequestValidator : AbstractValidator<GeneratorTemplateRequest>
    {
        private readonly IApplicationService applicationService;

        public GeneratorTemplateRequestValidator(IApplicationService applicationService)
        {
            this.applicationService = applicationService;

            RuleFor(t => t.WorkId).NotEmpty();

            RuleFor(t => t.ApplicationId)
                .MustAsync(async (entity, value, c) => await IsExistApplication(entity, value))
                .WithMessage("Нет приложения с таким Id.");

            RuleFor(t => t.Ek).NotEmpty();

            RuleFor(t => t.Action)
                .Must(t => t.ToLower() == GenerateTemplateActionsEnum.create.ToString() || t.ToLower() == GenerateTemplateActionsEnum.deactivate.ToString())
                .WithMessage($"Допустимые значения: {GenerateTemplateActionsEnum.create}, {GenerateTemplateActionsEnum.deactivate}");

        }

        //todo: сделать валидацию в тбл AppInWorks

        private async Task<bool> IsExistApplication(GeneratorTemplateRequest request, Guid applicationId)
        {
            return await applicationService.GetAsync(applicationId) != null;
        }
    }
}