我喜欢这个迁移文件：

Schema::create('posts', function($table)
{
    $table->engine = 'InnoDB';
    $table->increments('id')->unsigned();
    $table->string('title');
    $table->text('description')->nullable();
    $table->integer('sort_order')->default(0);
    $table->boolean('status')->default(0);
});

我也有种子：

class SeedPostsTable extends Seeder
{
    public function run()
    {
        $posts = $this->getPosts();

        foreach ($posts as $title => $column) {
            $posts[] = [
              'title' => $title,
              'slug' => Str::slug($title),
            ];
        }

        Post::insert($posts);
        Post::query()->update(['sort_order' => \DB::raw('`id`')]);
    }
}

作为数据库驱动程序，我使用Postgres，当我运行这个seeder时，得到这样的错误：

SQLSTATE[42883]: Undefined function: 7 ERROR:  operator does not exist: `integer`
LINE 1: update "posts" set "sort_order" = `id`
HINT:  No operator matches the given name and argument type. You might need to add an explicit type cast. (SQL: update "posts" set "sort_order" = `id`)

我不能在我的模型中设置public $incrementing = false;和protected $keyType = 'string';，因为我需要整数数据类型作为ID列。
如何修复此错误？