public IActionResult Index(string filterAction)
{
ExerciseDifficulty difficulty;
var isValidDifficulty = Enum.TryParse(filterAction.Capitalize(), out difficulty);
if (!isValidDifficulty)
difficulty = ExerciseDifficulty.Easy | ExerciseDifficulty.Intermediate | ExerciseDifficulty.Hard;
var filteredAchievements = _achievementService.FilterAchievements(difficulty);
var model = _achivementsViewService.ListAchievements(filteredAchievements);
return this.View(model);
}
