blog_tp6/app/sys/controller/Category.php

<?php
declare (strict_types = 1);
/**
 * +----------------------------------------------------------------------
 * | 栏目控制制器
 * +----------------------------------------------------------------------
 */
namespace app\admin\controller;

// 引入框架内置类
use think\facade\View;

class Category extends Base
{
    protected  $modelName = "\app\common\model\Category";

    public function index()
    {
        $list = $this->modelName::getList();

        $list = obj_tree($list, $pk = 'id', $pid = 'parent_id');

        View::assign('list', $list);

        return View::fetch();
    }

    /**
     * 新增 or 修改
     * @param int $id  info id 
     * @return mix 
     */
    public function save($id = 0)
    {
        if ($this->app->request->isPost()) {
            $params = $this->app->request->param();
            
            if ($params['category_name'] == '') {
                $this->error("名称不能为空");
            }

            try {
                $id = $params['id']; 
                unset($params['id']);

                if ($id != 0) {
                    $this->modelName::update($params, ['id' => $id]);
                } else {
                    $this->modelName::create($params);
                }
            } catch (\Exception $e) {
                $msg = $e->getMessage();

                $this->error("错误提示:".$msg);
            }
            $this->success('操作成功', (String)url('index'));
        } else {
            if ($id != 0) {
                $data = $this->modelName::find($id);
            } else {
                $data = null;
            }
            
            View::assign('data', $data);

            $list = obj_tree($this->modelName::select());

            View::assign('list', $list);

            return View::fetch();
        }
    }

    // 删除
    public function delete($id)
    {
        if ($this->app->request->isPost()) {
            if ($this->modelName::where('parent_id', $id)->value('id')) {
                return ['code'=>0, 'msg'=>'子栏目不为空, 若要删除请先清空子栏目'];
            }

            return $this->modelName::del($id);
        }
    }
}