crm/app/model/Camp.php

<?php

namespace app\model;

use think\Model;

class Camp extends Model
{

    public function campEmployee()
    {
        return $this->hasMany(CampEmployee::class, 'camp_id','id');
    }
    public function employee()
    {
        return $this->hasOne(CampEmployee::class, 'camp_id','id');
    }
    public function campPlan()
    {
        return $this->hasMany(CampPlan::class, 'camp_id','id');
    }
}