crm/app/model/ExamPaper.php

<?php

namespace app\model;

use think\Model;

class ExamPaper extends Model
{
    public $got_total_score = 0;
    public $done = 0;
    public $checked = 0;
    //relaitonship
    public function questions(){
        return $this->belongsToMany('ExamQuestion','exam_paper_question','question_id','paper_id');
    }
    public function result(){
        return $this->hasMany('ExamEmpResult','paper_id');
    }
}