wanyue_app/app/model/CollegeTeaching.php

<?php

namespace app\model;

use DateTimeInterface;
use support\Model;

class CollegeTeaching extends Model
{
    protected $table = 'college_teaching';

    protected $primaryKey = 'teaching_id';

    protected $dateFormat = 'U';

    public const CREATED_AT = 'teaching_addTime';

    public const UPDATED_AT = 'teaching_updateTime';

    public function serializeDate(DateTimeInterface $date)
    {
        return $date->format("Y-m-d H:i:s");
    }

    public function course()
    {
        return $this->hasOne(CollegeCourses::class, 'courses_id', 'teaching_courses_id');
    }
}