场景

• 最近在研究dingo/api and tymondesigns/jwt-auth； dingo/api的 transformer 功能是很有用处的; 但是Custom Transformation Layer功能在使用的时候报错 Call to undefined method App\Api\TransFormer\LessonTransformer::setCurrentScope()

分析

• 可能对Custom Transformation Layer 理解有误
• 借鉴了github issue , 继承League\Fractal\TransformerAbstract 实现transformer功能
  • 在 League\Fractal\TransformerAbstract接口中发现了这样一段话,

/**
 * Transformer Abstract
 *
 * All Transformer classes should extend this to utilize the convenience methods
 * collection() and item(), and make the self::$availableIncludes property available.
 * Extend it and add a `transform()` method to transform any default or included data
 * into a basic array.
 */  

解决

• 借鉴了[github issue] , 继承 League\Fractal\TransformerAbstract 实现tansformer功能 , 不在使用Dingo\Api\Contract\Transformer\Adapter
• 那么另外一个问题官方Custom Transformation Layer 到底是怎么用的呢? 后续继续研究

namespace App\Api\TransFormer;

use App\Lesson;
use League\Fractal\TransformerAbstract;

class LessonTransformer extends TransformerAbstract
{
    public function transform(Lesson $lesson) :array
    {
        return [
            "id" => $lesson['id'],
            "title" => $lesson['title'],
            "content" => $lesson["body"],
            "is_free" => !!$lesson['free']
        ];
    }
}