core/library/think/model/relation/OneToOne.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\relation;

use think\db\Query;
use think\Exception;
use think\Loader;
use think\Model;
use think\model\Relation;

/**
 * Class OneToOne
 * @package think\model\relation
 *
 */
abstract class OneToOne extends Relation
{
    // 预载入方式 0 -JOIN 1 -IN
    protected $eagerlyType = 1;
    // 当前关联的JOIN类型
    protected $joinType;
    // 要绑定的属性
    protected $bindAttr = [];
    // 关联方法名
    protected $relation;

    /**
     * 设置join类型
     * @access public
     * @param string $type JOIN类型
     * @return $this
     */
    public function joinType($type)
    {
        $this->joinType = $type;
        return $this;
    }

    /**
     * 预载入关联查询（JOIN方式）
     * @access public
     * @param Query    $query       查询对象
     * @param string   $relation    关联名
     * @param string   $subRelation 子关联
     * @param \Closure $closure     闭包条件
     * @param bool     $first
     * @return void
     */
    public function eagerly(Query $query, $relation, $subRelation, $closure, $first)
    {
        $name = Loader::parseName(basename(str_replace('\\', '/', get_class($query->getModel()))));