Laravel - production.ERROR: ErrorException: Trying to get property 'created_at' of non-object答案

【问题标题】：Laravel - production.ERROR: ErrorException: Trying to get property 'created_at' of non-objectLaravel - production.ERROR: ErrorException: Trying to get property 'created_at' of non-object
【发布时间】：2021-03-22 10:09:40
【问题描述】：

在 Laravel-5.8 中，我有这个代码：

$yearStatus = HrLeaveRequest::select('created_at')->where('employee_id', $userEmployee)->whereIn('leave_status', array(1, 3, 4))->orderBy('created_at', 'DESC')->first()->created_at;
//Get Specific current year from date
$specificYear = Carbon::createFromFormat('Y-m-d H:i:s', $yearStatus)->format('Y');
//Get Current Year
$currentYear = Carbon::now()->format('Y');
$currentDate = Carbon::now()->format('Y-m-d');

if ($currentYear > $specificYear){
    $currentstatus = HrLeaveRequest::select('leave_status')->where('employee_id', $userEmployee)->whereIn('leave_status', [1, 3, 4])->orderBy('created_at', 'DESC')->first();
  }else{
    $currentstatus = HrLeaveRequest::select('leave_status')->where('employee_id', $userEmployee)->whereDate('resumption_date', '<=', $currentDate)->whereIn('leave_status', [1, 3, 4])->orderBy('created_at', 'DESC')->first();
  }

无论何时：

$yearStatus = HrLeaveRequest::select('created_at')->where('employee_id', $userEmployee)->whereIn('leave_status', array(1, 3, 4))->orderBy('created_at', 'DESC')->first()->created_at;

为空，我收到此错误：

production.ERROR: ErrorException: Trying to get property 'created_at' of non-object

它指向：

$yearStatus = HrLeaveRequest::select('created_at')->where('employee_id', $userEmployee)->whereIn('leave_status', array(1, 3, 4))->orderBy('created_at', 'DESC')->first()->created_at;

我该如何解决这个问题？

谢谢

【问题讨论】：

标签： laravel

【解决方案1】：

您在数据库中没有使用该过滤器的记录：

$yearStatus = HrLeaveRequest::select('created_at')
  ->where('employee_id', $userEmployee)
  ->whereIn('leave_status', array(1, 3, 4))
  ->orderBy('created_at', 'DESC')
  ->first();

if (!$yearStatus) {
  dd($yearStatus); // null
}

$yearStatus = $yearStatus->created_at;

尝试在数据库中发送相同的选择以检查数据是否存在。

first() - 返回结果的第一条记录，如果结果中没有数据，则返回 null。您应该在使用前检查 first() 之后返回的数据。

【讨论】：

【解决方案2】：

你应该从数据库中获取记录，然后确保它不为空，然后获取字段的 created_at：

 $record= HrLeaveRequest::select('created_at')->where('employee_id', $userEmployee)->whereIn('leave_status', array(1, 3, 4))
->orderBy('created_at', 'DESC')->first();

if($record!=null)
{

    $record->created_at;
    //Get Specific current year from date
$specificYear = Carbon::createFromFormat('Y-m-d H:i:s', $yearStatus)->format('Y');
//Get Current Year
$currentYear = Carbon::now()->format('Y');
$currentDate = Carbon::now()->format('Y-m-d');

if ($currentYear > $specificYear){
    $currentstatus = HrLeaveRequest::select('leave_status')->where('employee_id', $userEmployee)->whereIn('leave_status', [1, 3, 4])->orderBy('created_at', 'DESC')->first();
  }else{
    $currentstatus = HrLeaveRequest::select('leave_status')->where('employee_id', $userEmployee)->whereDate('resumption_date', '<=', $currentDate)->whereIn('leave_status', [1, 3, 4])->orderBy('created_at', 'DESC')->first();
  }

}

当 $record 也为空时，您应该管理它...

【讨论】：

【解决方案3】：

只需从查询 created_at 中删除 ->first()

$yearStatus = HrLeaveRequest::select('created_at')->where('employee_id', $userEmployee)->whereIn('leave_status', array(1, 3, 4))->orderBy('created_at', 'DESC')->first();

【讨论】：