thinkphp/library/think/model/Relation.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2018 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

namespace think\model;

use think\db\Query;
use think\Exception;
use think\Model;

/**
 * Class Relation
 * @package think\model
 *
 * @mixin Query
 */
abstract class Relation
{
    // 父模型对象
    protected $parent;
    /** @var  Model 当前关联的模型类 */
    protected $model;
    /** @var Query 关联模型查询对象 */
    protected $query;
    // 关联表外键
    protected $foreignKey;
    // 关联表主键
    protected $localKey;
    // 基础查询
    protected $baseQuery;
    // 是否为自关联
    protected $selfRelation;

    /**
     * 获取关联的所属模型
     * @access public
     * @return Model
     */
    public function getParent()
    {
        return $this->parent;
    }

    /**
     * 获取当前的关联模型对象实例
     * @access public
     * @return Model
     */
    public function getModel()
    {
        return $this->query->getModel();
    }