Laravel模型在工厂中播种，列与同一表中的列相关

我在拉威尔播了一些假数据 我有一张桌子

Schema::create('categories', function (Blueprint $table) {
        $table->bigIncrements('id');
        $table->integer('parent_id')->default(0);
        $table->string('name');
        $table->integer('depth');
        $table->timestamps();
 });

父id必须包含categories.id的数据

我想知道这是最好的方法吗

可分级播种机

分类工厂

---

也许有人能为同样的结果写出更好的解决方案？我尝试了很多，这一个很有效，但我认为代码应该比现在看起来更专业。

2019\u 05\u 03\u*****\u create\u categories\u table.php

Schema::create('categories', function (Blueprint $table) {
    $table->bigIncrements('id');
    $table->unsignedInteger('parent_id')->default(0);
    $table->string('name')->nullable();
    $table->integer('depth')->default(0);
    $table->timestamps();
});

CategoryFactory.php

$factory->define(Category::class, function (Faker $faker) {
    return [
        'parent_id' => Category::count() ? Category::pluck('id')->random() : 0,
        'name' => ucfirst($faker->word),
    ];
});

CategoriesTableSeeder.php

public function run()
{
    factory(Category::class, rand(1, 10))->create()->each(
        function ($category) {
            factory(Category::class, rand(1, 5))->create(['parent_id' => $category->id]);
        }
    );
}

$factory->define(Category::class, function (Faker $faker) {
    return [
        'parent_id' => Category::count() ? Category::pluck('id')->random() : 0,
        'name' => ucfirst($faker->word),
    ];
});

public function run()
{
    factory(Category::class, rand(1, 10))->create()->each(
        function ($category) {
            factory(Category::class, rand(1, 5))->create(['parent_id' => $category->id]);
        }
    );
}