php - 使用 Laravel 的 Eloquent 删除 hasManyThrough 关系行

Question

我有三个模型:Advertiser、PtcAd 和 PtcCampaign。删除广告商时，我想删除所有相关的PtcAds和PtcCampaigns。 广告商通过PtcAds有许多PtcCampaigns。

广告商模型

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();
}

PtcCampaign 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关系都正常，所以我真的不知道可能出了什么问题。我的下一个尝试是在广告商的 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。

Answer 1

看来问题出在删除语句的顺序上。

尝试更改如下顺序:

public function delete()
{
    $this->ptcCampaigns()->delete();

    $this->ptcAds()->delete();

    return parent::delete();
}