尝试在 Laravel 9 中读取 null 属性“id”

Question

您好，我遇到一个问题，我的代码是：

if($user->plan->id == 1) {
    return view($this->activeTemplate . 'user.autopool', compact('pageTitle', 'commissions', 'deposit', 'transactions', 'commission', 'withdraw', 'transaction', 'username', 'balance', 'user', 'plans'));
} else {
    return view($this->activeTemplate . 'user.nopool', compact('pageTitle', 'user'));
}

我想从我的代码中消除这个错误。我被困在这里了。

Answer 1

$user->plan evaluates to null. You don't guard against this.

---

• 如果您使用的是 PHP8，则可以使用 nullsafe 运算符。

if ($user->plan?->id)

• If you're using PHP7, you can use laravel's optional() function.

if (optional($user->plan)->id)

• If the relationship between User and Plan is a belongsTo relationship (User belongsTo Plan), you might be better off just using the foreign key in the user model.

if ($user->plan_id)