如何在 Laravel Eloquent 中使用變量作為屬性名稱

Question

無論如何在 eloquent 示例中使用變量：

public function showLessons($skill)
    {
        $user = (\App\User::where('id', Auth::user()->getId())->first());
        $type = $user->type;
        if ($type === "student") {
            $bs = ($user->student_bronze_ . $skill);
            $ss = ($user->student_silver_ . $skill);
            $gs = ($user->student_gold_ . $skill);
        } elseif ($type === "school") {
            $bs = ($user->school_bronze_ . $skill);
            $ss = ($user->school_silver_ . $skill);
            $gs = ($user->school_gold_ . $skill);
        };
        return view('pages.lessons', compact("bs", "ss", "gs"));
    }

我正在嘗試檢查用戶的級別是否與課程的 ID 相同或更高

Answer 1

我認為您的主要問題是：您能否在 laravel Eloquent model 上使用變量作為屬性名稱。

答案是肯定的，你用花括號把它包起來{}

$user->{$type.'_'.$medal.'_'.$skill};

如果您將一些代碼移動到用戶 Model 您的 controller 會變得更整潔一些。

// User.php
public function skill($medal, $skill) {
    $type = $this->type;    
    return $this->{$type.'_'.$medal.'_'.$skill};
}

然后你的 Controller 變得更干凈：

public function showLessons($skill)
{
    $user = Auth::user();
    
    $bs = $user->skill('bronze', $skill);
    $ss = $user->skill('silver', $skill);
    $gs = $user->skill('gold', $skill);
    
    return view('pages.lessons', compact("bs", "ss", "gs"));
}