Laravel 4多2个记录改变了记录

Question

我正在使用数据透视表。我有一个模型类别和产品模型。

<?php

class Product extends \Eloquent {
    protected $table = 'products';

    public function categories(){
        return $this->belongsToMany('Product', 'category_product', 'category_id', 'product_id');
    }
}


<?php

class Category extends \Eloquent {

    protected $table = 'categories';

    public function products(){
        return $this->belongsToMany('Category', 'category_product', 'product_id', 'category_id');
    }

}

当我使用时：

$products = Product::with('categories')->get();

转储查询，我得到以下查询：

"select `categories`.*, `category_product`.`category_id` as `pivot_category_id`, `category_product`.`product_id` as `pivot_product_id` from `categories` inner join `category_product` on `categories`.`id` = `category_product`.`product_id` where `category_product`.`category_id` in (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)"

如您所见，innerJoin将使用product_id和category_id完成。是否可以将这些设置为internal_id，或者我是否需要创建自定义查询？