Thinkphp5 关联模型

必须建立两个模型分类模型(attr)、文章模型(article) 

attr模型

<?php
namespace app\common\model;
use think\Model;

class Attr extends Model{
  
  
}

article模型

1 <?php
2 namespace app\common\model;
3 use think\Model;
4 
5 class Article extends Model{
6 
7 }

hasOne

hasMany

 1 <?php
 2 namespace app\common\model;
 3 use think\Model;
 4 
 5 class Attr extends Model{
 6     // 关联文章模型
 7     public function article()
 8     {
 9         return $this->hasMany('article','pid','id');
10         //return $this->hasOne('article','pid');
11     }
12     // 可用
13     public function s(){
14         $id = 9;
15         $attr = $this->get($id);
16         // 查询单条
17         //$res = $attr->article()->find();
18         // 查询多条
19         $res = $attr->article()->select();
20         return $res;
21 
22     }
23 
24 }

控制器调用

 1 <?php
 2 namespace app\index\controller;
 3 use think\Controller;
 4 use think\Model;
 5 class Index extends Controller
 6 {
 7     protected $model;
 8     public function _initialize()
 9     {
10         parent::_initialize(); // TODO: Change the autogenerated stub
11         $this->model = model('attr');
12     }
13 
14     public function index(){
15         $d = $this->model->s();
16         print_r($d);
17     }
18 
19    
20 
21 }

输出结果：只有article 内容（没有attr内容）。hasMany关联相当于Model('article')