thinkphp/library/think/model/relation/MorphOne.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 MorphOne extends Relation
{
    // 多态字段
    protected $morphKey;
    protected $morphType;
    // 多态类型
    protected $type;

    /**
     * 构造函数
     * @access public
     * @param Model  $parent    上级模型对象
     * @param string $model     模型名
     * @param string $morphKey  关联外键
     * @param string $morphType 多态字段名
     * @param string $type      多态类型
     */
    public function __construct(Model $parent, $model, $morphKey, $morphType, $type)
    {
        $this->parent    = $parent;
        $this->model     = $model;
        $this->type      = $type;
        $this->morphKey  = $morphKey;
        $this->morphType = $morphType;
        $this->query     = (new $model)->db();
    }

    /**
     * 延迟获取关联数据
     * @param string   $subRelation 子关联名
     * @param \Closure $closure     闭包查询条件
     * @return false|\PDOStatement|string|\think\Collection
     */
    public function getRelation($subRelation = '', $closure = null)
    {
        if ($closure) {
            call_user_func_array($closure, [ & $this->query]);
        }
        $relationModel = $this->relation($subRelation)->find();

        if ($relationModel) {