App\Libraries\OsuAuthorize::checkUserFavourite PHP Method

    public function checkUserFavourite($user)
    {
        $prefix = 'errors.beatmapsets.';
        $this->ensureLoggedIn($user);
        if ($user->favouriteBeatmapsets()->count() > 99) {
            return $prefix . 'too-many-favourites';
        }
        return 'ok';
    }