Laravel 工厂如何将数据添加到相关表？

问题描述

在 laravel 8 应用程序中，我为带有工厂的广告表添加了虚拟数据：

$ads = Ad::factory()->count(10)->expired($year,$month)->create([
]);

还有database/factories/AdFactory.PHP：

<?PHP

namespace Database\Factories;

use Config;
use Carbon\Carbon;
use App\Models\Ad;
use Illuminate\Database\Eloquent\Factories\Factory;
use Illuminate\Support\Str;
use \Cviebrock\EloquentSluggable\Services\SlugService;

class AdFactory extends Factory
{
    protected $model = Ad::class;

    public function deFinition()
    {
        $text= $this->faker->text;
        $slugValue = SlugService::createSlug(Ad::class,'slug',$text);

        return [
            'title' => $text,'ad_token' => $text,'slug' => $slugValue,'phone_display' => (rand(1,3) == 1),'has_locations' => (rand(1,4) == 1),'status' => 'A','price' => mt_rand(10,500),'ad_type' => (rand(1,2) == 1 ? 'B' : 'S'),'description' => $this->faker->paragraphs(rand(1,4),true),'creator_id' => rand(1,5),];
    }

    public function expired($year,$month)
    {
        return $this->state(function (array $attributes) use($year,$month) {
            $dateStr= $year.'-'.str_pad($month,2,"0",STR_PAD_LEFT).'-01';
            $startDate= Carbon::createFromFormat('Y-m-d',$dateStr);
            return [
                'expire_date' => $this->faker->dateTimeInInterval($startDate,'1 month',Config::get('app.timezone'))->format('Y-m-d H:i:s')
            ];
        });
    }
}

它工作正常，但我想知道如何将虚拟数据添加到相关的 ad_categories（有 ad_id 字段）？ 定义方法返回广告对象（带有新 ID），我可以在哪里访问它？

谢谢！

解决方法

您可以创建一个 CategoryFactory 类并创建 Dummy 类别，然后选择一个随机类别作为 category_id

一对多关系

    //...
    public function definition()
    {
        return [
            //your code
            'creatory_id' => $this->faker->randomElement(Category::all())['id'],];
    }
    //...

或

    public function definition()
    {
        return [
            //your code
            'creatory_id' => factory(Category::class)->create()->id,];
    }

第二种解决方案将为每个广告创建一个新类别

多对多关系

namespace Database\Factories;

use App\Models\AdFactory;
use App\Models\Category;
use Illuminate\Database\Eloquent\Factories\Factory;
use Illuminate\Support\Str;

class AdFactory extends Factory
{
    /**
     * The name of the factory's corresponding model.
     *
     * @var string
     */
    protected $model = Ad::class;

    /**
     * Configure the model factory.
     *
     * @return $this
     */
    public function configure()
    {
        return $this->afterCreating(function (Ad $newAd) { 
            $adCategory = AdCategory::factory()->count(1)->create([ 'ad_id' => $newAd->id,'category_id' => $this->faker->randomElement(Category::all())['id']); 
        }); 
    }

    // ...
}

欲了解更多信息，请访问 https://laravel.com/docs/8.x/database-testing#factory-callbacks

和https://laravel.com/docs/8.x/database-testing#polymorphic-many-to-many-relationships