vendor/topthink/think-orm/src/model/relation/BelongsTo.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2019 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
declare (strict_types = 1);

namespace think\model\relation;

use Closure;
use think\db\BaseQuery as Query;
use think\helper\Str;
use think\Model;

/**
 * BelongsTo关联类
 */
class BelongsTo extends OneToOne
{
    /**
     * 架构函数
     * @access public
     * @param  Model  $parent 上级模型对象
     * @param  string $model 模型名
     * @param  string $foreignKey 关联外键
     * @param  string $localKey 关联主键
     * @param  string $relation  关联名
     */
    public function __construct(Model $parent, string $model, string $foreignKey, string $localKey, string $relation = null)
    {
        $this->parent     = $parent;
        $this->model      = $model;
        $this->foreignKey = $foreignKey;
        $this->localKey   = $localKey;
        $this->query      = (new $model)->db();
        $this->relation   = $relation;

        if (get_class($parent) == $model) {
            $this->selfRelation = true;
        }
    }

    /**
     * 延迟获取关联数据
     * @access public
     * @param  array   $subRelation 子关联名
     * @param  Closure $closure     闭包查询条件
     * @return Model
     */
    public function getRelation(array $subRelation = [], Closure $closure = null)
    {
        if ($closure) {
            $closure($this->getClosureType($closure));
        }