ThinkPHP5 一对多,多对多关联模型的尝试

首先是一对多:

查询卖家自定义分类: 建立卖家表seller ,建立分类表category

表中记得创建 外键字段  seller_id,category_id ,

TP5框架中创建两个seller 和categorr模型,

<?php
/**
 * Created by PhpStorm.
 * User: 爱憎分明
 * Date: 2018/12/24
 * Time: 21:04
 */

namespace app\api\model;


use think\Model;

class Category extends Model
{
    public function seller(){
        return $this->belongsTo('Seller','seller_id');
    }
}

<?php
/**
 * Created by PhpStorm.
 * User: 爱憎分明
 * Date: 2018/12/23
 * Time: 18:55
 */

namespace app\api\model;


use think\Model;

class Seller extends Model
{
    public function category(){ 
        return $this->hasMany('Category','seller_id'); 
    }
}

调用模型方法查询关联数据

//关联读取分类
    public function read_category(){
        $result=0;
        $message='';
        $categories=[];
        foreach ($this->seller->category as $value){ //这里category为属性 也可以调用category() 方法达到其他目的 
            array_push($categories,$value->getData());
        }
        if ($categories){
            $result=1;
            $message='读取成功';
            return ['result'=>$result,'message'=>$message,'categories'=>$categories];
        }

    }