dm-v2.com/Application/Admin/Model/QrViewModel.class.php

<?php

namespace Admin\Model;


use Think\Model\ViewModel;

class QrViewModel extends ViewModel
{
    public $viewFields = array(
        'bach'=>array(),
        'bach_product'=>array('num','is_verif','_on'=>'bach.id=bach_product.bach_id'),
        'product_box_type'=>array('_on'=>'bach_product.product_id=product_box_type.id'),
        'product'=>array('name'=>'product_name','_on'=>'product_box_type.product_id=product.id'),
        'box_type'=>array('name'=>'box_type_name','_on'=>'product_box_type.box_type_id=box_type.id')
    );
}