Question

我想使用JSON文件将数据从后端传递到前端，但不是将任何时间戳作为键和值返回关联，而是从表中返回额外的字段。

任何可以帮我隐藏额外字段的人都会？

namespace App\Http\Controllers;
use App\Notification;
use App\Status;

use Illuminate\Http\Request;

class ChartController extends Controller
{
    public  function speedHistory($notification_id){

        $o_notification = Notification::find(intval($notification_id));
        $o_status = Status::where('name','speed')->first();

        $o_response = $o_notification->statuses()->where('status_id', $o_status->id)
        ->select('values AS value', 'created_at AS timestamp')->orderBy('created_at','DESC')->get();

        if($o_response){
            return response()->json($o_response->toArray());
        }else{
            // return an empty json array instead of false
            //return false;
            return response()->json(array());
        }
    }
}

返回看起来像这样，我希望在这种情况下获得72的值和时间戳。

[{"value":"72","pivot":{"notification_id":1,"status_id":2,"values":"72","created_at":"2017-01-10 12:48:29","updated_at":"2017-01-10 12:48:29"}}]

Answer 1

该关系将返回Laravel Collection，因此您可以使用only function来获取所需的密钥。

像这样：

$o_response = $o_notification->statuses()
    ->where('status_id', $o_status->id)
    ->select('values AS value', 'created_at AS timestamp')
    ->orderBy('created_at', 'DESC')
    ->get()
    ->only(['value', 'created_at']);

<强>更新

如果集合中有多个结果，则上述答案将无效。在这种情况下，您可以使用the map function。

$o_response = $o_notification->statuses()
    ->where('status_id', $o_status->id)
    ->select('values AS value', 'created_at AS timestamp')
    ->orderBy('created_at','DESC')
    ->get()
    ->map(function ($v) {
        return [
            'value' => $v->value,
            'created_at' => $v->created_at
        ];
    });

Answer 2

这就是你得到你想要的结果的方法：

$o_response = $o_notification->statuses()->where('status_id', $o_status->id)
    ->orderBy('created_at','DESC')
    ->get()
    ->transform(function ($item, $key) {
        return collect([
            'values' => $item->pivot->values,
            'created_at' => $item->pivot->created_at
        ]);
    });

然后返回

return response()->json($o_response);

JSON文件返回带有额外字段

2 个答案: