hainan/app/Models/Category.php

<?php

namespace App\Models;

use Dcat\Admin\Traits\ModelTree;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Factories\HasFactory;

class Category extends BaseModel
{
    use HasFactory;
	use ModelTree;

	// 模型树需要的三个属性
	protected $parentColumn = 'pid';
	protected $orderColumn = 'sort';
	protected $titleColumn = 'name';

    public function __construct(array $attributes = [])
	{
		parent::__construct($attributes);
		$this->timestamps = false;
	}

	//覆盖父类，不按id desc排序
	protected static function booted() { }

	public static function selectOptions(\Closure $closure = null)
	{
		$options = (new static())->withQuery($closure)->buildSelectOptions();
		return collect($options)->all();
	}
}