public async Task <bool> AddCardToCollectionAsync(Guid collectionId, Guid cardId, Guid userId) { if (collectionId == Guid.Empty) { throw new AppException($"Поле {nameof(collectionId)} не указано"); } if (cardId == Guid.Empty) { throw new AppException($"Поле {nameof(cardId)} не указано"); } if (userId == Guid.Empty) { throw new AppException($"Поле {nameof(userId)} не указано"); } var desiredCollection = await repository.FindByIdAsync(collectionId, userId); if (desiredCollection.CardItems.Contains(cardId)) { throw new AppException("В коллекции нет даной карты"); } desiredCollection.CardItems.Add(cardId); try { await repository.UpdateAsync(desiredCollection); } catch { return(false); } return(true); }