public function guardaRating()
 {
     $nivel = filter_input(INPUT_POST, 'nivel');
     $id = filter_input(INPUT_POST, 'id');
     $rating = filter_input(INPUT_POST, 'rating');
     if ($nivel == 'telesecundaria') {
         $user_id = Auth::user()->id;
         $ratingSaved = RatingTelesecundaria::firstOrCreate(['user_id' => $user_id, 'telesecundaria_id' => $id]);
         $ratingSaved->rating = $rating;
         $ratingSaved->save();
     }
     if ($nivel == 'telebachillerato') {
         $user_id = Auth::user()->id;
         $ratingSaved = \App\Model\Mediateca\RatingTelebachillerato::firstOrCreate(['user_id' => $user_id, 'telebachillerato_id' => $id]);
         $ratingSaved->rating = $rating;
         $ratingSaved->save();
     }
     return 'rating guardado';
 }