Question

我的项目是在Laravel 5.5中我将表格 wposts 用于laravel中的多级菜单和同时发布的帖子。表格的字段是：

- id
- parentpost (id of parent post)
- title
- porder (order of posts in the same menu)

在Controller中我有函数 getwposts 来使用递归获取帖子以获得多级菜单。

private function getwposts($parentid = 0,$wposts = []){

    foreach(Wpost::where('parentpost', $parentid)->orderby('porder')->get() as $pwpost)
    {
        echo $pwpost->id.'-' ;
        $wposts[$pwpost->id] = $this->getwposts($pwpost->id,$wposts);
    }
return $wposts;    
}

在之后的同一个Controller中，我有一个名为预览的功能，可以呈现视图

public function preview($templ){

   $pwposts = \App\Wpost::with('parent')->get();

    $pwposts= $this->getwposts(0,[]);
    dd($pwposts);
    return view('templates.$templ1,compact('pwposts'));
}

我快到了。 tabble的wright顺序是

但结果是

虽然使用echo我在树视图中看到记录的正确顺序但是没有问题。我的模特是

 namespace App;

 use Illuminate\Database\Eloquent\Model;

 class Wpost extends Model
 {
    protected $fillable = 
   ['parentpost','title','body','author','storeid','porder','haskids'];
   protected $table = 'wposts';

   public function children(){
       return $this->hasmany(Wpost::class, 'parentpost');
   }   

   public function parent(){
       return $this->belongsTo(Wpost::class, 'parentpost');
   }
 }

我堆积如山。你能帮助我吗？提前谢谢

Answer 1

您可以尝试https://github.com/etrepat/baum

我用过，我感觉很好

Answer 2

在您的模型中添加$with = ['children']

 namespace App;

 use Illuminate\Database\Eloquent\Model;

 class Wpost extends Model
 {
    protected $fillable = 
   ['parentpost','title','body','author','storeid','porder','haskids'];
   protected $table = 'wposts';
   protected $with = ['children'];



   public function children(){
       return $this->hasmany(Wpost::class, 'parentpost');
   }   

   public function parent(){
       return $this->belongsTo(Wpost::class, 'parentpost');
   }
 }

现在，如果您想以递归方式获取孩子，可以使用。

   $pwposts = \App\Wpost::with('children')->get();

希望这有帮助

Answer 3

尝试一下：

| id | parend_id | name     | url                 |

| 1  |     0     | Level 1  | /level_one          |

| 2  |     1     | Sublevel | /level_one/sublevel |

| 3  |     0     | Level 2  | /level_two          |

型号

public function children() {
    return $this->hasMany('App\Menus', 'parent_id', 'id');
}

public static function tree() {
    return static::with(implode('.', array_fill(0, 100, 'children')))->where('parent_id', '=', '0')->get();
}

控制器

$components = new Component;
try {
     $menu = $components->tree();
} catch (Exception $e) {}
return response()->json($menu);

laravel中的多级菜单，具有递归功能

3 个答案: