如果数据库为空,代码将无法工作

如果数据库不包含条目,则代码将不起作用。如果存在条目,则代码有效。有人知道为什么只有在数据库中已经有条目的情况下,代码才起作用吗?

我得到超时错误:

Maximum execution time of 30 seconds exceeded

_

我使用代码创建用户,然后创建与邀请URL相关的用户配置文件。将创建一个长度为7个字符的唯一代码,即个人邀请URL。 我需要循环,因为必须检查代码是否已生成。还是有更好的解决方案?

 protected function create(array $data)
{
    if($data['gender'])

    {
        $avatar = 'defaults\avatars\male.jpg';
    }

    else

    {
        $avatar = 'defaults\avatars\female.jpg';
    }

    if (array_key_exists('team_id', $data) && $data['team_id']){
        $team = $data['team_id'];
    }else{
       $team = Null;
    }

    if (isset($data['invited_id']) && $data['invited_id']){
        $invited_from = $data['invited_id'];
    }else{
        $invited_from = Null;
    }

    $user = User::create([
        'name' => $data['name'],
        'team_id' => $team,
        'invited_from_id' => $invited_from,
        'username' => $data['username'],
        'email' => $data['email'],
        'password' => bcrypt($data['password']),
        'birthday' => $data['birthday'],
        'gender' => $data['gender'],
        'slug' => str_slug($data['username']),
        'avatar' => $avatar,
        'active' => false,
        'activation_token' => str_random(255)
    ]);

    $user->profile()->save(new Profile());

    while (true) {
        $randomstring = substr(str_shuffle("0123456789abcdefghijklmnopqrstuvwxyz"), 0, 7);
        if (Invite::where('url','!=', $randomstring)->exists()) {
            Invite::create([
            'user_id' => $user->id,
            'url' => $randomstring
            ]);
            break;
        }
    }

    //store notify for user in database
    $usern = User::find($invited_from);

    if($usern) {
        User::find($usern->id)->notify(new NotifyInvite($user));
    }

    return $user;
}