Laravel自己的模型上的父母/孩子关系 [英] Laravel parent/children relationship on it's own model

问题描述

我想获得所有至少有一个孩子的代金券，一个代金券可以有多个代金券子代，但是任何代金券只能有一个父代.

I want to get all the vouchers that have at least one child, a voucher can have multiple voucher children, but any voucher can only have one parent.

我使用以下模型和调用对其进行设置，并根据需要生成查询，直到这一部分为止:'vouchers'.'parent_id' = 'vouchers'.'id'

I set it up with the following models and calls, and the query it generates is as desired, until this part: 'vouchers'.'parent_id' = 'vouchers'.'id'

想要的功能:

$vouchers = Voucher::has('children')->get();

或

$vouchers = Voucher::has('parent')->get();

结果查询

select * from `vouchers` where `vouchers`.`deleted_at` is null 
and (select count(*) from `vouchers` where `vouchers`.`deleted_at` is null 
and `vouchers`.`parent_id` = `vouchers`.`id` 
and `vouchers`.`deleted_at` is null ) >= 1

型号:

class Voucher extends baseModel {

    public function parent()
    {
        return $this->belongsTo('Voucher', 'parent_id');
        // return $this->belongsTo('Voucher', 'parent_id', 'id'); <- attempted but din't work
    }

    public function children()
    {
        return $this->hasMany('Voucher', 'parent_id');
    }
}

推荐答案

已在5.0中报告并修复了此问题.

This issue has been reported and fixed in 5.0 https://github.com/laravel/framework/pull/8193

不幸的是，版本4没有后端口.

Unfortunately there is no back port for the version 4.

但是，如果您想自己应用此修复程序，则可以在此处查看修改列表: https://github.com/laravel/framework/pull/8193/files

However if you want to apply the fix yourself you can see the list of modifications here : https://github.com/laravel/framework/pull/8193/files

请注意，修改框架的代码库存在风险，但是Laravel 4.x版本将不再有错误修复，只有几个月的安全修复.

Be carefull, modifying the framework's code base is at risk but there will be no more bug fixes on Laravel 4.x version, only security fixes for a few more month.

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