浅谈laravel5.5 belongsToMany自身的正确用法

网络编程 2024/11/18 佚名

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场景

用户之间相互关注，记录这种关系的是followers表(follower_id 发起关注的人 followed_id被关注的人)

现在的多对多的关系就不再是传统的三张表的关系了，这种情况多对多关系应该怎么声明呢"_blank" href="https://laravel.com/docs/5.6/eloquent-relationships#many-to-many">https://laravel.com/docs/5.6/eloquent-relationships#many-to-many

In addition to customizing the name of the joining table, you may also customize the column names of the keys on the table by passing additional arguments to the belongsToMany method. The third argument is the foreign key name of the model on which you are defining the relationship, while the fourth argument is the foreign key name of the model that you are joining to:

belongsToMany方法传递的参数是可以定制的以达到个性化的需求,

第一个参数是第二个Model

第二个参数是关系表名

第三个参数是第一个Model在关系表中的外键ID

第四个参数是第二个Model在关系表中的外键ID

解决

经过分析

1. 第一个Model是User 第一个Model也是User

2. 关系表名是 'followers'

 /**
  * 关注当前用户的
  * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany
  */
 public function followers()
 {
  return $this->belongsToMany(self::class, 'followers', 'followed_id','follower_id')->withTimestamps()
   ->withTimestamps();
 }

 /**
  * 被当前用户关注的用户
  */
 public function followed()
 {
  return $this->belongsToMany(self::class, 'followers', 'follower_id', 'followed_id');
 }

以上这篇浅谈laravel5.5 belongsToMany自身的正确用法就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。

laravel5.5,belongsToMany