application/admin/controller/NeedType.php

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<?php
namespace app\admin\controller;
use app\admin\model\NeedTypeSpace;
class NeedType extends Base {
    public function index() {
        
        $need_type_tree=need_type_tree(); 
       $this->assign('need_type_tree', $need_type_tree);
        return $this->fetch();
    }
    public function add_need_type($id) { 
       
          $ico_space=db('ico_space')->select();
           $this->assign('ico_space', $ico_space);
           
           $this->assign('id', $id);
           
        return $this->fetch();
    }
    public function del_need_type_action() {
      $id=request()->param('id');
      //防止把所有顶级类型一下全删除,因为顶级类型pid=0
      if(!$id){die;}
       
       //列出传递的来下级的id
       $NeedTypeSpace=  NeedTypeSpace::where('pid', '=',  $id)->select();
         foreach ($NeedTypeSpace as $key => $value) {
            //删除传递的来下级的下级id
         NeedTypeSpace::where('pid', '=',   $value['id'])->delete();
       }
       //删除传递的来下级的id子类
       NeedTypeSpace::where('pid', '=', $id)->delete();
        //删除传递的来的id
      NeedTypeSpace::where('id', '=',  $id)->delete();
       return $this->json_data($id);
    }

    public function add_need_type_action() {
        $need = new NeedTypeSpace;
        $id=request()->param('id');
        if($id) {$need->pid = $id;}
         $need->type_name = request()->param('type_name');
         $need->order = request()->param('order');
          $need->ico_name = request()->param('ico_name');
          $arr_pic=request()->post('pic/a');
                        if(!empty($arr_pic)){
      $pic_string=implode(",", $arr_pic);
                        }
           $need->pic = $pic_string;
        if ($need->save()) {
            $this->redirect('NeedType/index');
        } else {
            $this->error('新增失败');
        }
      }  
    public function edit_need_type($id) {
   
       $ico_space=db('ico_space')->select();
        $NeedTypeSpace = NeedTypeSpace::get(['id' => $id]);
       if(!empty( $NeedTypeSpace['pic'])){