Laravel:调用另一个工厂内部的工厂

use App\Models\User;
use App\Models\Post;
use Illuminate\Database\Eloquent\Factories\Factory;

class UserFactory extends Factory
{
    protected $model = User::class;

    public function definition()
    {
        return [
            'name' => $this->faker->name,
            'email' => $this->faker->unique()->safeEmail,
            'password' => bcrypt('password'),
        ];
    }
}

class PostFactory extends Factory
{
    protected $model = Post::class;

    public function definition()
    {
        return [
            'user_id' => UserFactory::new(), // 调用UserFactory生成一个用户实例
            'title' => $this->faker->sentence,
            'content' => $this->faker->paragraph,
        ];
    }
}