删除Laravel 6/7中的相关模型 [英] Delete related models in Laravel 6/7

问题描述

有很多相关问题，但不幸的是我找不到有效的解决方案

There are many related questions but unfortunately I can't find working solution

我有Laravel模型，删除此模型后，我想

I have Laravel model and when this model is deleted I want to

1. 删除一些相关模型
2. 删除模型时运行自定义SQL查询

我的Laravel的模型类看起来很像(如您所见，模型可以具有不同的关系类型)

My Laravel's model class looks like (as you can see models can have different relation types)

class ModelA extends Model
{
  public functions modelsB() {
    return $this->hasMany(ModelB:class);
  }

  public functions modelsC() {
    return $this->belongsToMany(ModelC:class);
  }

  // other related models
 
  // place where I am expecting actual deleting is happening
  public static function boot() {
        parent::boot();

        self::deleting(function($modelA) { 

          $modelA->modelsB()->get()->each->delete(); 
         
          foreach($modelA->modelsC as $modelC){
            $modelC->delete();
          }
    });
  }
}

ModelA被删除，但是所有相关数据都保留了，而且我不确定它是否被调用.也许我错过了什么?我应该为我的ModelA扩展一些课程吗?还是应该将此启动功能放在其他地方?

ModelA is deleted but all related data stays, and I am not sure that it is even being called. Maybe I missed something? Should I extend some class for my ModelA? Or this boot function should be placed somewhere else?

推荐答案

您是否将其级联到ModelB的迁移文件中，如下所示:

Did you cascade it in your migration file of your ModelB like so:

$table->foreignId('modelA_id')
    ->onDelete('cascade');
    ->constrained()

`onDelete('cascade')是重要的组成部分，请注意，这是以下方面的简写:

The `onDelete('cascade') is the important part, mind you this is a shorthand for:

$table->unsignedBigInteger('modelA_id');

$table->foreign('modelA_id')->references('id')
    ->on('modelA')->onDelete('cascade');

这应该为您完成大部分繁重的工作，您可以在 Laravel文档中找到更多信息迁移

This should do most of the heavy lifting for you and you can find more info at Laravel Docs Migrations

如果您不喜欢这种方法，而是希望使用基于事件的方法，那么请尝试在您的ModelA类中这样做:

If you don't like this approach and would prefer an event-based approach then try doing this in your ModelA class:

protected static function booted()
{
    static::deleted(function ($modelA) {
        $modelA->modelsB()->delete();
        // ...
    });
}

这篇关于删除Laravel 6/7中的相关模型的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！