public async Task <Link> AddLinkAsync(string FullUrl, string ownerId)
{
Link old_link = await Links.OrderBy(l => l.Number).LastOrDefaultAsync();
int new_num = old_link is null ? 1 : (old_link.Number + 1);
string id = StringGenerator.getString(new_num);
Link link = new Link
{
Id = id,
Number = new_num,
FullUrl = FullUrl,
Clicks = new List <Click>(),
OwnerId = ownerId
};
await Links.AddAsync(link);
return(link);
}