public async Task <DiscountExtendedDto> GetByIdAsync(Guid id)
{
var discount = await _discountRepository.GetByIdAsync(id);
var vendor = await _vendorRepository.GetByIdAsync(discount.VendorId);
var discountDto = _mapper.Map <DiscountExtendedDto>(discount);
discountDto.IsFavorite = await _favoritesService.DiscountIsInFavorites(discountDto.Id);
discountDto.Links = _mapper.Map <IEnumerable <LinkDto> >(vendor.Links);
discountDto.WorkingHours = vendor.WorkingHours;
discountDto.Phones = _mapper.Map <IEnumerable <PhoneDto> >(vendor.Phones.Join(
discount.PhonesIds,
p => p.Id,
i => i,
(p, i) => p));
return(discountDto);
}