我有三个模型,彼此之间有一对多:
国家
class Country extends Model
{
protected $fillable=['name','sort'];
public $timestamps=false;
public function region(){
return $this->hasMany('App\Models\Region');
}
}
地区
class Region extends Model
{
protected $fillable=['country_id','name','sort'];
public $timestamps=false;
public function country()
{
return $this->belongsTo('App\Models\Country');
}
public function city()
{
return $this->hasMany('App\Models\City');
}
}
城市
class City extends Model
{
protected $table='cities';
protected $fillable=['region_id','name','sort'];
public $timestamps=false;
public function region()
{
return $this->belongsTo('App\Models\Region');
}
}
当我们自动删除国家/地区时,删除所有子项目关系,即删除该区域和城市
我这样做:
型号国家
public static function boot() {
parent::boot();
static::deleting(function($country) {
//remove related rows region and city
// need an alternative variation of this code
$country->region()->city()->delete();//not working
$country->region()->delete();
return true;
});
}
}
或
模型区域
public static function boot() {
parent::boot();
// this event do not working, when delete a parent(country)
static::deleting(function($region) {
dd($region);
//remove related rows city
$region->city()->delete();
return true;
});
}
}
options with cascading deletes database, please do not offer
更新
I found the answer
使用闭包查询构建器,删除相关模型
型号国家
public static function boot() {
parent::boot();
static::deleting(function($country) {
//remove related rows region and city
$country->region->each(function($region) {
$region->city()->delete();
});
$country->region()->delete();//
return true;
});
}
Laravel Eloquent ORM - Removing rows and all the inner relationships
1 回答
快速回顾一下:
$model->related_model
将返回相关模型 .$model->related_model()
将返回关系对象 .您可以执行
$model->related_model->delete()
或$model->related_model()->get()->delete()
来访问模型上的delete()
方法 .处理删除相关(或子)模型的另一种方法是在编写迁移时使用外键约束,请检查https://laravel.com/docs/master/migrations#foreign-key-constraints