thinkphp/library/think/model/Merge.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;
use think\db\Query;
use think\Model;

class Merge extends Model
{

    protected $relationModel = []; // HAS ONE 关联的模型列表
    protected $fk            = ''; //  外键名 默认为主表名_id
    protected $mapFields     = []; //  需要处理的模型映射字段，避免混淆 array( id => 'user.id'  )

    /**
     * 构造函数
     * @access public
     * @param array|object $data 数据
     */
    public function __construct($data = [])
    {
        parent::__construct($data);

        // 设置默认外键名 仅支持单一外键
        if (empty($this->fk)) {
            $this->fk = strtolower($this->name) . '_id';
        }
    }

    /**
     * 查找单条记录
     * @access public
     * @param mixed        $data  主键值或者查询条件（闭包）
     * @param string|array $with  关联预查询
     * @param bool         $cache 是否缓存
     * @return \think\Model
     */
    public static function get($data = null, $with = [], $cache = false)
    {
        $query = self::parseQuery($data, $with, $cache);
        $query = self::attachQuery($query);
        return $query->find($data);
    }

    /**
     * 附加查询表达式
     * @access protected
     * @param \think\db\Query $query 查询对象
     * @return \think\db\Query
     */