设定工厂关系种子时,“变形”字段没有默认值

我有一个 Recipe Review 型号:

class Recipe extends Model
{
    use HasFactory;

    protected $guarded = ['id'];

    public function reviews(): MorphToMany
    {
        return $this->morphToMany(Review::class, 'reviewable');
    }
}

class Review extends Model
{
    use HasFactory;

    protected $guarded = ['id'];
}

class RecipeFactory extends Factory
{
    protected $model = Recipe::class;

    public function definition()
    {
        return [
            'name' => $this->faker->sentence(5, true),
        ];
    }
}

class ReviewFactory extends Factory
{
    protected $model = Review::class;

    public function definition()
    {
        return [
            'review' => $this->faker->paragraphs(1, true),
        ];
    }
}

当我尝试使用以下方法来创建新的测试记录时:

Recipe::factory()->hasAttached(
    Review::factory()
        ->count(5)
);

我得到了SQL错误:

SQLSTATE[HY000]: General error: 1364 Field 'reviewable_type' doesn't have a default value

如何让Laravel填写正确的变形 reviewable_type 和 reviewable_id