Question

我有这个控制器可以在多对多的关系中访问数据透视表。数据透视表中的列是值和created_at。我希望这个控制器返回一个值数组和created_at

public function status($s_type)
{

    $o_health_status = Status::where('name', 'health')->first();
    $o_speed_status = Status::where('name', 'speed')->first();

    if ($s_type === 'health'){

        $o_response = $this->statuses()->where('status_id', $o_health_status->id)
        ->select('values','created_at')->orderBy('created_at','ASC')->first();

        if($o_response === null){
            return 'unsigned';
        }
        $o_response = $o_response->values;
        return $o_response;         
    }else{

        $o_response = $this->statuses()->where('status_id', $o_speed_status->id)
        ->select('values','created_at')->orderBy('created_at', 'desc')->first();
        if($o_response === null){
            return 'unsigned';
        }

        $o_response = $o_response->values;
        return $o_response;


    }

Answer 1

你需要使用pluck。这将从集合中获取所有必需的元素：所以我清理了一下，应该看起来像这样：

public function status($s_type)
{

    $o_health_status = Status::where('name', 'health')->first();
    $o_speed_status = Status::where('name', 'speed')->first();
    $o_response = $s_type === 'health' ? $this->statuses()->pluck('values','created_at')->where('status_id', $o_health_status->id)
            ->select('values', 'created_at')->orderBy('created_at', 'asc')->first() : $this->statuses()->pluck('values','created_at')->where('status_id', $o_speed_status->id)
            ->select('values', 'created_at')->orderBy('created_at', 'desc')->first();

    return ! $o_response ? 'unsigned' : $o_response->values;
}

Answer 2

在laravel中，如果您需要从查询中返回数组，则可以使用pluck()代替select()

$o_response = $this->statuses()->where('status_id', $o_health_status->id)
    ->pluck('values','created_at')->orderBy('created_at','ASC');// ->first();
//I think you no need to use ->first(); here.

Docs（向下滚动到检索列值列表）

laravel，我怎么能改变代码返回一个数组？

2 个答案: