private async Task <int?> GetRandomJokeId(string category, IJokeRepository jokeRepository, IUnitOfWork uow)
{
var categoryRepository = uow.GetRepository <ICategoryRepository>();
ICollection <int> jokesIds = null;
if (!string.IsNullOrEmpty(category))
{
if (!await categoryRepository.AnyAsync(c => c.Title.Equals(category)))
{
throw new ArgumentException($"No jokes for category \"{category}\" found.");
}
else
{
jokesIds = await jokeRepository.FindAndMapAsync(j => j.Id,
j => j.JokeCategories.Any(jc => jc.Category.Title.Equals(category)));
}
}
else
{
jokesIds = await jokeRepository.FindAndMapAsync(j => j.Id);
}
int?randomId = null;
if (jokesIds != null && jokesIds.Count() != 0)
{
randomId = GetRandomElement(jokesIds);
}
return(randomId);
}