Laravel模型返回“未定义的属性:stdClass :: $ name" [英] Laravel model returns "Undefined property: stdClass::$name"

问题描述

我一直在尝试使我的类模型正常工作，但它总是返回此错误.
该模型如下所示:

I keep trying to get my class model to work but it keeps returning this error.
The model looks like:

class Food
{
    protected $id;

    public function __construct($id)
    {
        $results = DB::select('select * from food where id = ?', array($id));
        if ( empty($results) )
        {
            throw new Exception('Food do not exsist.');
        } else {
            $this->food = (object) $results;
        }
    }

    public function name()
    {
        return $this->food->name;
    }

}

当我称呼它时:

$food = new Food($id);
var_dump($food->name()); exit;

返回:

Undefined property: stdClass::$name

推荐答案

根据您的代码，DB::select将返回一个包含多个对象(可能多个)的数组，然后将其分配给$this->food

Base on your code, DB::select will return an array which contains several objects (may be more than one), and then you assign it to $this->food.

请记住，$this->food看起来像

Array (
    [0] => stdClass Object (
        [name] => 'Beef'
    )
)

实际上，$this->food->name试图访问未定义的属性.

Actually, $this->food->name is trying to access an undefined property.

解决方案1 ​​:

您应该使用$this->food[0]->name进行访问.

虽然看起来很怪异，但是可以正常工作.

Although it looks weird, but it works.

解决方案2 :

为什么不调用Food::find($id)而不是$food = new food($id)

您可以通过阅读以下内容进一步了解 http://laravel.com/docs/eloquent

You can learn more by reading this http://laravel.com/docs/eloquent

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