我有这些：
员额表

public function up()
    {
        Schema::create('posts', function (Blueprint $table) {
            $table->id();
            $table->string('title', 64);
            $table->string('teaser', 128)->nullable();
            $table->text('content', 50000);
            $table->timestamps();
        });
    }

岗位模型

use HasFactory;

    protected $fillable = ['title', 'teaser', 'content'];

    public function tags()
    {
        return $this->belongsToMany(Tag::class, 'post_tag', 'post_id', 'tag_id');
    }

标签表

public function up()
    {
        Schema::create('tags', function (Blueprint $table) {
            $table->id();
            $table->string('text', 32);
        });
    }

标签模型

use HasFactory;
    public $timestamps = false;
    public $fillable = ['text'];

    public function posts()
    {
        return $this->belongsToMany(Post::class, 'post_tag', 'tag_id', 'post_id');
    }

post_tag表

public function up()
    {
        Schema::create('post_tag', function (Blueprint $table) {
            $table->id();
            $table->unsignedInteger('post_id');
            $table->unsignedInteger('tag_id');
        });
    }

当我尝试创建一个带有标签的新帖子时，我得到这个错误：

SQLSTATE[22007]: Invalid datetime format: 1366 Incorrect integer value: 'test' for column `laravel`.`post_tag`.`tag_id` at row 1
INSERT INTO
  `post_tag` (`post_id`, `tag_id`)
VALUES
  (31, test)

我是这么做的：

public function store(PostFormValidation $request)
    {
        $newpost = Post::create($request->validated());
        $newpost->tags()->sync($request->tags);
        return redirect(route('home'));
    }

但是当我把时间戳从迁移中移除并指定我不在模型中使用它们时，为什么它会抱怨时间戳呢？我错过了什么？
提交的“标签”是一个多选。