public async Task <IActionResult> AddAvitoRentAdverts([FromBody] RentURLFilterModel model) { var adverts = await HTMLParser.ParseAdvertsFromURL(model.ToURLString()); foreach (AdvertModel advert in adverts) { var existingadvert = _context.Adverts.SingleOrDefault(row => row.Url == advert.Url); if (existingadvert != null) { continue; } _context.Adverts.Add(advert); await _context.SaveChangesAsync(); } return(Ok(model.ToURLString())); }