Laravel - 如何使用 Maatwebsites 验证与 company_id 相关的唯一字段

如何解决Laravel - 如何使用 Maatwebsites 验证与 company_id 相关的唯一字段

我使用 Laravel-5.8 和 Maatwebsite-3.1 导入了这个 excel：

class FirstGradeLevelSheetImport implements ToModel,WithHeadingRow,WithBatchInserts,WithValidation
{
    private $errors = []; // array to accumulate errors    
    use Importable,SkipsErrors; 

    public function model(array $row)
    {  
        $grade_data = [
            'grade_level_code'                  => $row['grade_level_code'] ?? '','grade_level_name'                  => $row['grade_level_name'],'company_id'                        => Auth::user()->company_id,'created_by'                        => Auth::user()->id,'created_at'                        => date("Y-m-d H:i:s"),'is_active'                         => 1,];        

       $grade = HrGradeLevel::create($grade_data);        
    } 

    // this function returns all validation errors after import:
    public function getErrors()
    {
        return $this->errors;
    }    

    public function rules(): array
    {
        return [
            'grade_level_code' => [
                'required','min:2','max:210',],'grade_level_name' => [
                'required','string','min:3','max:80'               
            ],];    
    }        
}

在文章https://docs.laravel-excel.com/3.1/imports/validation.html中，您只能验证一个字段是否唯一

如何验证grade_level_code 相对于company_id 是唯一的？

谢谢