public ProfileDto GetProfileByUserName(string userName)
{
if (userName.IsNullOrEmpty())
{
throw new ArgumentNullException(nameof(userName));
}
var profile = _profileProvider.GetProfileByUserName(userName);
if (profile == null)
{
throw new BusinessLogicException($"Profile for user with userName = {userName} was not found.");
}
var following = _profileProvider.GetFollowingByUserName(userName);
var result = _mapper.Map <ProfileDto>(profile);
result.Followers = profile.Followers.Select(x => _mapper.Map <ProfileDto>(x)).ToList();
result.Following = following.Select(x => _mapper.Map <ProfileDto>(x)).ToList();
return(result);
}