thinkphp/library/think/model/relation/BelongsToMany.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\Collection;
use think\Db;
use think\db\Query;
use think\Exception;
use think\Loader;
use think\Model;
use think\model\Pivot;
use think\model\Relation;
use think\Paginator;

class BelongsToMany extends Relation
{
    // 中间表表名
    protected $middle;
    // 中间表模型名称
    protected $pivotName;
    // 中间表模型对象
    protected $pivot;
    // 中间表数据名称
    protected $pivotDataName = 'pivot';

    /**
     * 构造函数
     * @access public
     * @param Model  $parent     上级模型对象
     * @param string $model      模型名
     * @param string $table      中间表名
     * @param string $foreignKey 关联模型外键
     * @param string $localKey   当前模型关联键
     */
    public function __construct(Model $parent, $model, $table, $foreignKey, $localKey)
    {
        $this->parent     = $parent;
        $this->model      = $model;
        $this->foreignKey = $foreignKey;
        $this->localKey   = $localKey;
        if (false !== strpos($table, '\\')) {
            $this->pivotName = $table;
            $this->middle    = basename(str_replace('\\', '/', $table));
        } else {
            $this->middle = $table;
        }
        $this->query = (new $model)->db();
        $this->pivot = $this->newPivot();

        if ('think\model\Pivot' == get_class($this->pivot)) {
            $this->pivot->name($this->middle);