分形API調用不返回內容

Question

我使用分形包打包了一些API方法來輸出內容。當我調用特定資源時，所有內容都將返回空白。

要檢查一切是否正常，我執行了一些內容變量的打印。例如，如果我在索引函數中使用$ incidents變量，我會按照預期返回數據庫中的所有條目。

當我在API控制器的respondWithCollection方法中調用$ collection變量時也是如此。數據也可以在這裏找到。但瀏覽器的輸出僅僅是這樣的：

{

"data": { 
"headers": {} 
} 
} 

爲了簡單起見，這是顯示數據庫的所有結果的方法：

class ApiIncidentsController extends ApiController { 

    protected $incidentTransformer; 
    protected $fractal; 

    function __construct(IncidentTransformer $incidentTransformer){ 
     $this->incidentTransformer = $incidentTransformer; 
     $this->beforeFilter('auth.basic', ['on' => 'post']); 
     $this->fractal = new Manager(); 
     parent::__construct($this->fractal); 
    } 

    public function index() 
    { 
     $incidents = Incident::all(); 

     if(! $incidents) { 
      return Response::json([ 
       'error' => [ 
        'message' => 'There are no incidents in the database.', 
        'code' => 100 
       ] 
      ], 404); 
     } else { 
      return $this->respond([ 
       'data' => $this->respondWithCollection($incidents, new IncidentTransformer), 
      ]); 
     } 
    } 

的API控制器來管理這些電話是這樣的：

class ApiController extends Controller { 

    protected $statusCode = 200; 
    protected $fractal; 

    public function __construct(Manager $fractal) { 
     $this->fractal = $fractal; 
    } 

    public function getStatusCode() { 
     return $this->statusCode; 
    } 

    public function setStatusCode($statusCode) { 
     $this->statusCode = $statusCode; 
     return $this; 
    } 

    public function respond($data, $headers = []) { 
     return Response::json($data, $this->getStatusCode(), $headers); 
    } 

    protected function respondWithItem($item, $callback) { 
     $resource = new Item($item, $callback); 
     $rootScope = $this->fractal->createData($resource); 
     return $this->respondWithArray($rootScope->toArray()); 
    } 

    protected function respondWithArray(array $array, array $headers = []) { 
     return Response::json($array, $this->statusCode, $headers); 
    } 

    protected function respondWithCollection($collection, $callback) { 
     $resource = new Collection($collection, $callback); 
     $rootScope = $this->fractal->createData($resource); 
     return $this->respondWithArray($rootScope->toArray()); 
    } 

更新1 這是IncidentTransformer：

use League\Fractal\TransformerAbstract; 


class IncidentTransformer extends TransformerAbstract { 
    public function transform(Incident $incident) { 
     return [ 
      'incidentReference' => $incident['incidentReference'], 
      'latitude' => $incident['latitude'], 
      'longitude' => $incident['longitude'], 
      'archived' => (boolean) $incident['incidentArchived'] 
     ]; 
    } 
} 

更新2 我嘗試別的東西，通過移除respond包裝。然後一切都很好。但我想使用我寫的摘要代碼的響應函數。這似乎是問題。當我將數據傳入函數時，沒有任何東西被返回。當我轉儲變量數據時，返回了一個JSON響應。但是其中的respondWithCollection方法返回一個數組。我不明白爲什麼會發生這種情況。這可能是問題嗎？

I adapted the method like this: 

    public function index() 
    { 
     $incidents = Incident::all(); 

     if(! $incidents) { 
      return Response::json([ 
       'error' => [ 
        'message' => 'There are no incidents in the database.', 
        'code' => 100 
       ] 
      ], 404); 
     } else { 
      $data = $this->respondWithCollection($incidents, new IncidentTransformer); 
      return $this->respond([ 
       'data' => $data 
      ]); 
     } 
    } 

但仍然輸出爲空。所以它必須是具有響應功能的東西。

Answer 1

您將返回Response::json()兩次。

$this->respond返回Response::json，而且$this->respondWithCollection()返回respondWithArray（），這也是。

試着這麼做：

public function index() 
{ 
    $incidents = Incident::all(); 

    if(! $incidents) { 
     return Response::json([ 
      'error' => [ 
       'message' => 'There are no incidents in the database.', 
       'code' => 100 
      ] 
     ], 404); 
    } else { 
     // getCollection instead of respondWithCollection 
     $data = $this->getCollection($incidents, new IncidentTransformer); 
     return $this->respond([ 
      'data' => $data 
     ]); 
    } 
} 

-

// getCollection instead of respondWithCollection 
protected function getCollection($collection, $callback) { 
    $resource = new Collection($collection, $callback); 
    $rootScope = $this->fractal->createData($resource); 
    // don't respond again 
    //return $this->respondWithArray($rootScope->toArray()); 
    return $rootScope->toArray(); 
}