Question

我写了一个变换器类，用于在API中输出数据：

APPTRANSFORMER：

<?php
namespace App\Transformer;

use App\Classes\AED;
use League\Fractal\TransformerAbstract;

class AEDTransformer extends TransformerAbstract {
    public function transform(AED $aed) {
        return [
            'owner' => $aed->owner,
            'street' => $aed->street,
            'latitude' => $aed->latitude,
            'longitude' => $aed->longitude,
            'annotationType' => $aed->annotation_type
        ];
    }
}

获取所请求数据的控制器方法：

控制器：

// Show specific AED
public function show($id) {
    // Find AED by ID
    $aed = AED::find($id);
    $rawData = $this->respondWithItem($aed, new AEDTransformer);
    $meta = ['meta' => 'TestMeta'];
    $data = array_merge($rawData, $meta);

    if (!$aed) {
        return $this->respondNotFound("AED existiert nicht.");
    }

    return $data;
}

当我调用URL时，我收到错误：

AEDTransformer.php第16行中的ErrorException：参数1传递给 App \ Transformer \ AEDTransformer :: transform（）必须是。的实例 App \ Classes \ AED，null给定，调用 /home/vagrant/Projects/MFServer/vendor/league/fractal/src/Scope.php on 第307行和定义

AED CLASS：

<?php
namespace App\Classes;

use Illuminate\Database\Eloquent\Model;

class AED extends Model {

    protected $table = 'aeds';
    protected $fillable = ['owner', 'street', 'postal_code', 'locality', 'latitude', 'longitude', 'annotation_type'];
    public $timestamps = true;

    public $id;
    public $owner;
    public $object;
    public $street;
    public $postalCode;
    public $locality;
    public $latitude;
    public $longitude;
    public $annotation_type;
    public $distance;

    public function set($data) {
        foreach ($data as $key => $value) {
            $this->{$key} = $value;
        }
    }
}

我认为它必须与＆＃34;扩展模型＆＃34;在AED班，但我没有看到原因。这只是一个扩展。或者我是否错误地查看错误的地方并理解错误信息？

Answer 1

您收到此错误是因为$aed = AED::find($id);正在返回null，这意味着该记录不存在。

你可以这样做

public function show($id) {

   // Find AED by ID

    $aed = AED::find($id);

    if (!$aed) { //just to be sure
       return $this->respondNotFound("AED existiert nicht.");
    }


    $rawData = $this->respondWithItem($aed, new AEDTransformer);
    $meta = ['meta' => 'TestMeta'];
    $data = array_merge($rawData, $meta);

    return $data;
}

Laravel分形经理

1 个答案: