使用 Laravel 的 Eloquent 删除 hasManyThrough 关系行
Delete hasManyThrough relationship rows using Laravel's Eloquent
我有三个模型,Advertiser
、PtcAd
和 PtcCampaign
。删除 Advertiser 时,我想删除所有相关的 PtcAds 和 PtcCampaigns。 Advertiser 通过 PtcAds.
有许多 PtcCampaigns
广告客户模型
use SoftDeletes;
protected $dates = ['deleted_at'];
public function ptcAds()
{
return $this->hasMany('App\PtcAd');
}
public function ptcCampaigns()
{
return $this->hasManyThrough('App\PtcCampaign', 'App\PtcAd');
}
public function delete()
{
$this->ptcAds()->delete();
// I'VE TRIED WITH AND WITHOUT THIS
$this->ptcCampaigns()->delete();
return parent::delete();
}
PtcAd 模型
use SoftDeletes;
protected $fillable = ['advertiser_id', 'title'];
protected $dates = ['deleted_at'];
public function advertiser()
{
return $this->belongsTo('App\Advertiser');
}
public function ptcCampaigns()
{
return $this->hasMany('App\ptcCampaign');
}
public function delete()
{
$this->ptcCampaigns()->delete();
return parent::delete();
}
Ptc活动模型
use SoftDeletes;
public $timestamps = false;
protected $fillable = ['ptc_ad_id', 'clicks'];
protected $dates = ['paused_at', 'deleted_at'];
public function ptcAd()
{
return $this->belongsTo('App\PtcAd');
}
我的测试:
public function test_delete_advertiser()
{
$advertiser = factory(Advertiser::class)->create();
$ptcAd = factory(PtcAd::class)->create(['advertiser_id' => $advertiser->id]);
$ptcCampaign = factory(PtcCampaign::class)->create(['ptc_ad_id' => $ptcAd->id]);
$this->assertTrue($advertiser->delete());
$this->assertFalse(Advertiser::all()->contains($advertiser));
$this->assertFalse(PtcAd::all()->contains($ptcAd));
// THE FOLLOWING TEST DOESN'T WORK!
$this->assertFalse(PtcCampaign::all()->contains($ptcCampaign));
}
// ALL OF THE FOLLOWING TESTS WORK!
public function test_delete_ad()
{
$ptcAd = factory(PtcAd::class)->create();
$ptcCampaign = factory(PtcCampaign::class)->create(['ptc_ad_id' => $ptcAd->id]);
$this->assertTrue($ptcAd->delete());
$this->assertFalse(PtcAd::all()->contains($ptcAd));
$this->assertFalse(PtcCampaign::all()->contains($ptcCampaign));
}
test_delete_advertiser()
测试中的$this->assertFalse(PtcCampaign::all()->contains($ptcCampaign))
失败,为什么?
我有更多的测试来确保所有的关系都有效,所以我真的不知道什么可能是错的。我的下一次尝试是在 Advertiser 的 delete() 方法中创建 foreach
,但也许有更简单的方法,我想了解为什么这不起作用。
您可以使用 Laravel 的模型事件 (deleting
) 删除相关模型,如下所示:
class Advertiser extends Eloquent
{
public function ptcAds()
{
return $this->hasMany('PtcAd');
}
// this is a recommended way to declare event handlers
protected static function boot() {
parent::boot();
static::deleting(function($adv) { // before delete() method call this
$adv->ptcAds()->delete();
// do the rest of the cleanup...
});
}
}
// Same for PtcCompaigns
class PtcAd extends Eloquent
{
public function ptcCompaigns()
{
return $this->hasMany('PtcCompaigns');
}
// this is a recommended way to declare event handlers
protected static function boot() {
parent::boot();
static::deleting(function($ptc_ad) { // before delete() method call this
$ptc_ad->ptcCompaigns()->delete();
// do the rest of the cleanup...
});
}
}
希望对您有所帮助!
看来问题出在删除语句的顺序上。
尝试按如下所示更改顺序:
public function delete()
{
$this->ptcCampaigns()->delete();
$this->ptcAds()->delete();
return parent::delete();
}
我有三个模型,Advertiser
、PtcAd
和 PtcCampaign
。删除 Advertiser 时,我想删除所有相关的 PtcAds 和 PtcCampaigns。 Advertiser 通过 PtcAds.
广告客户模型
use SoftDeletes;
protected $dates = ['deleted_at'];
public function ptcAds()
{
return $this->hasMany('App\PtcAd');
}
public function ptcCampaigns()
{
return $this->hasManyThrough('App\PtcCampaign', 'App\PtcAd');
}
public function delete()
{
$this->ptcAds()->delete();
// I'VE TRIED WITH AND WITHOUT THIS
$this->ptcCampaigns()->delete();
return parent::delete();
}
PtcAd 模型
use SoftDeletes;
protected $fillable = ['advertiser_id', 'title'];
protected $dates = ['deleted_at'];
public function advertiser()
{
return $this->belongsTo('App\Advertiser');
}
public function ptcCampaigns()
{
return $this->hasMany('App\ptcCampaign');
}
public function delete()
{
$this->ptcCampaigns()->delete();
return parent::delete();
}
Ptc活动模型
use SoftDeletes;
public $timestamps = false;
protected $fillable = ['ptc_ad_id', 'clicks'];
protected $dates = ['paused_at', 'deleted_at'];
public function ptcAd()
{
return $this->belongsTo('App\PtcAd');
}
我的测试:
public function test_delete_advertiser()
{
$advertiser = factory(Advertiser::class)->create();
$ptcAd = factory(PtcAd::class)->create(['advertiser_id' => $advertiser->id]);
$ptcCampaign = factory(PtcCampaign::class)->create(['ptc_ad_id' => $ptcAd->id]);
$this->assertTrue($advertiser->delete());
$this->assertFalse(Advertiser::all()->contains($advertiser));
$this->assertFalse(PtcAd::all()->contains($ptcAd));
// THE FOLLOWING TEST DOESN'T WORK!
$this->assertFalse(PtcCampaign::all()->contains($ptcCampaign));
}
// ALL OF THE FOLLOWING TESTS WORK!
public function test_delete_ad()
{
$ptcAd = factory(PtcAd::class)->create();
$ptcCampaign = factory(PtcCampaign::class)->create(['ptc_ad_id' => $ptcAd->id]);
$this->assertTrue($ptcAd->delete());
$this->assertFalse(PtcAd::all()->contains($ptcAd));
$this->assertFalse(PtcCampaign::all()->contains($ptcCampaign));
}
test_delete_advertiser()
测试中的$this->assertFalse(PtcCampaign::all()->contains($ptcCampaign))
失败,为什么?
我有更多的测试来确保所有的关系都有效,所以我真的不知道什么可能是错的。我的下一次尝试是在 Advertiser 的 delete() 方法中创建 foreach
,但也许有更简单的方法,我想了解为什么这不起作用。
您可以使用 Laravel 的模型事件 (deleting
) 删除相关模型,如下所示:
class Advertiser extends Eloquent
{
public function ptcAds()
{
return $this->hasMany('PtcAd');
}
// this is a recommended way to declare event handlers
protected static function boot() {
parent::boot();
static::deleting(function($adv) { // before delete() method call this
$adv->ptcAds()->delete();
// do the rest of the cleanup...
});
}
}
// Same for PtcCompaigns
class PtcAd extends Eloquent
{
public function ptcCompaigns()
{
return $this->hasMany('PtcCompaigns');
}
// this is a recommended way to declare event handlers
protected static function boot() {
parent::boot();
static::deleting(function($ptc_ad) { // before delete() method call this
$ptc_ad->ptcCompaigns()->delete();
// do the rest of the cleanup...
});
}
}
希望对您有所帮助!
看来问题出在删除语句的顺序上。
尝试按如下所示更改顺序:
public function delete()
{
$this->ptcCampaigns()->delete();
$this->ptcAds()->delete();
return parent::delete();
}